| 主权项 |
1. A method of manufacturing containers from blanks of plastic material on a production line comprising a critical machine having a proper tempo, the method comprises:
a phase of heating blanks as they pass through an oven provided with a plurality of radiation sources, at a predetermined speed of travel (V) and heating profile; a phase of blowing the blanks in a blowing unit, in order to form the containers, said method comprising:
(a) modifying the speed (V) of movement of the blanks in accordance with the tempo of the critical machine, wherein the modification is incremental and corresponds only to a percentage of a final modification sought;(b) modifying the heating profile with regard to the modified speed;(c) establishing, at the end of a heating phase, an actual thermal profile of at least one blank;(d) measuring a pressure in said blank during the blowing phase and detecting at least one singular pressure point (B);(e) measuring a first difference between the actual thermal profile of the blank and a theoretical thermal profile, and a second difference between the singular pressure point and a theoretical singular pressure point;(f) as long as the differences are not both below a respective predetermined tolerance, repeat operations b) to e);(g) as long as the differences are both below the respective tolerance, and while the speed of travel (V) has not reached a predetermined final value, repeat operations a) to e). |
