PLEATED PACKAGE HAVING A REINFORCED CENTRAL REGION WITH PRE-EXPANDED PLEATS

摘要

A package is made from a flexible rectangular sheet with a reinforced central region (2) which has pre-expanded pleats (1), while the side portions (4) have flat pleats (3) secured at the ends thereof. The device facilitates the expansion of the reinforced central region (2) and the subsequent formation of dihedral portions which increase the load resistance in the direction of the pleats. The reinforced central region (2) may further be provided with flutings extending parallel to the pleats.