Capsule e.g. crown cap, fabrication method for e.g. effervescent wine bottle, involves forming extruded tube made up of thermoplastic material by die and axially drawing tube in order to obtain axially elongated tube

摘要

The method involves forming an extruded tube (21) made of thermoplastic material by a die (31) of diameter D0, thickness E0 and area S0. The tube is axially drawn in order to obtain an axially elongated tube (22) of an area S1, where the value of S0/S1 is between 2 and 10. The tube is radially expanded for forming a radially expanded tube (23). The tube (23) is cut into several portions (24). Independent claims are also included for the following: (a) a heat-shrinkable cap intended to cork a mouth of bottle (b) a heat-shrinkable crown cap intended to cork the mouth of bottle (c) a cover intended to cork the mouth of an effervescent wine bottle (d) a stick of corks or covers formed by stacking of the corks and covers.