Oven for heating blanks such as thermoplastic preforms or intermediate containers has conveyors passing to and fro in two or more parallel branches connected by loop

摘要

The oven (1) has conveyors (2) to carry and move blanks, especially thermoplastic preforms or intermediate containers, passing in line on either side of heaters (3). Each conveyor has at least two parallel branches (4, 5) running close to one another in forward and reverse directions and connected by a loop (8) outside the oven's heating zone. A variant of the design has the conveyor made with two pairs of parallel branches passing on either side of the heaters, and two loops outside the heating zones. The oven's heaters are in the form of infrared lamps, with reflectors (9) on the opposite surfaces.