Hookup stem and electric hookup

An injection nozzle (30) heated by an electric heater and comprising an electric hookup (50;

• 60) being fitted with a hookup stem (48;
• 70), where
• (a) the heater is a thick film heater comprising a dielectric layer (42), and a heating conductor track (44) deposited on the outer surface of the dielectric layer (42),
• (b) the hookup stem (48;
• 70) comprises a shank element (54;
• 72) and a connecting segment (56;
• 74) making contact with the minimum of one adhesion layer (62;
• 64;
• 66) and/or a contact paste (52),
• (c) the connecting segment (56;
• 74) is discoid and exhibits a larger diameter than does the shank element (54;
• 72),
• (d) at least one transition element (58;
• 76) is provided between the shank element (54;
• 72) and the connecting segment (56;
• 74) and is designed in a manner that the diameter of the shank element (54;
• 72) and that of the connecting segment (56;
• 74) merge into each other step-wise or continuously,
• (e) the hookup stem (48;
• 70) is designed in a manner it may be affixed by means of at least one electrically conducting adhesion layer (62;
• 64;
• 66) and the contact paste (52) to said heater, and
• (f) at least two electrically conducting adhesion layers (62, 64, 66) are configured between the connecting segment (56;
• 74)of the hookup stem (48;
• 70) and the heater in a manner to connect them, the adhesion layers (62, 64, 66) and the contact paste (52) exhibiting different properties, different compositions and/or different adhesion layer materials,
• (g) wherein, each adhesion layer (52, 62, 64, 66) is matched to the particular directly adjacent adhesion layer (52, 62, 64, 66) and/or to a directly adjacent, electrically conducting component (44, 48;
• 62;
• 70) to produce a stable connection therebetween.