In the third step , the bellows article which, as now removed from the core 10 and gelled, is constituted only by the first wall region 1 and the first material for the second region 2 is then exposed to the action of {HEAD ~ an ionizing radiation} for hardening {TAIL ~ the first PVC material} into the second wall region 2 
for hardening
In the third step , the bellows article which , as now removed from the core 10 and gelled , is constituted only by the first wall region 1 and the first material for the second region 2 is then exposed to the action of { HEAD ~ an ionizing radiation } for hardening { TAIL ~ the first PVC material } into the second wall region 2
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