VERFAHREN UND VORRICHTUNG ZUM VERBESSERN DER STEIFIGKEIT EINES KUNSTSTOFFBEHAELTERS.

摘要

PCT No. PCTFR/89/00468 Sec. 371 Date Jul. 26, 1990 Sec. 102(e) Date Jul. 26, 1990 PCT Filed Sep. 15, 1989 PCT Pub. No. WO90/03263 PCT Pub. Date Apr. 5, 1990.The stiffness of a flexible, substantially parallelepipedal container formed by shaping and welding a film which is made of a synthetic material and which is to enclose a liquid to be packaged, is improved by applying, before shaping, a second layer of a film formed of an identical or a different material, as a top film, to the surface of the film forming the container which does not subsequently come into contact with the liquid to be packaged. The top film includes a plurality of strips corresponding to the vertical surfaces of the final container which are welded to the film forming the container before shaping, along lines corresponding to the edges of the final parallelepipedal container.