Dry calibration device for extruders

A dry calibration device (1) for extruders, comprising:

• a calibration head (2) having a calibration duct (3) in which an article of manufacture can be inserted, said calibration head (2) further including:
• a longitudinal extension axis (A);
• an inner surface (4b) defining said duct (3);
• and
• an outer surface (4a) opposite to said inner surface (4b);
• a heat exchange jacket (5) placed in contact with said calibration head (2), said heat exchange jacket (5) comprising:
• a thermally conductive element (6) placed in contact with said outer surface (4a) and defining a contact surface (6a) with said outer surface (4a), said contact surface (6a) extending without a break along said longitudinal extension axis (A);
• the thermally conductive element (6) being of one piece construction and fully surrounding said calibration head (2);
• and
• suction means (9) associated with said calibration duct (3),
• wherein the heat exchange jacket (5) comprises a support (17) for the thermally conductive element (6), inside the support (17) there being a channel (7) for circulating cooling or heating fluid, said channel (7) surrounding the conductive element (6);
• wherein said suction means (9) comprise a plurality of suction ducts (10) made in the calibration head (2) and in fluid communication with said calibration duct (3),
• wherein said suction means (9) comprise two slots (12) located on the heat exchange jacket (5) and on two opposite sides of said thermally conductive element (6),
• and wherein
• said two slots (12) are in communication with said plurality of suction ducts (10) by means of cavities (11) made on a wall (4) of the calibration head (2),
• and said suction means (9) comprise a pair of further ducts (13) each associated to a respective slot (12) of said two slots (12).