Vacuum application in continuous vacuum forming of tubular synthetic parts

摘要

An installation for making synthetic material tubular parts vacuum formed in a forming tunnel consisting of two endless chains of shells (5a) having forming impressions (6) has an internal vacuum feed circuit. The internal vacuum feed circuit for -1 of the shells (5a) of a pair (5a,5b) forming a length of the tubular part consists of -1 longitudinal groove (18), blind at -1 end (18a) and emerging parallel to the impression (6) and from the same face of the impression. The groove (18) connects with the feed windows (7) machined into the throats of the impression (6).