Apparatus for injection molding of plastic materials

An apparatus for injection molding of plastic material, comprising:

• a mold,
• at least one plate,
• a hot runner distributor of the plastic material,
• at least one injector for injecting the plastic material from the distributor into the mold, and
• an actuator for controlling opening and closing of the at least one injector, the actuator including a fluid jack having a cylinder,
• wherein the actuator is supported by the hot runner distributor and cooling thereof is performed by thermal exchange contact with said at least one plate,
• wherein for cooling of the actuator there is provided at least one body made of thermally conductive material at least partly surrounding the actuator in an axially slidable fashion and maintained in thermal exchange contact with said at least one plate by a magnetic force,
• wherein said body has a radial wall facing said cylinder and defining a planar contact surface with said at least one plate,
• wherein said body is free from a liquid cooling circuit, and
• wherein at least one from among said radial wall and said at least one plate incorporates at least one permanent magnet.