Machine for the manufacture of packing containers

US4203795A · kind A · utility

Assignee

• AB Ziristor

Inventors

• Herwig Pupp · Lund, SE
• Birger Andersson · Hagfors, SE

Key dates

• Filing date: Feb 27, 1978
• Grant date: May 20, 1980
• Expiry date: Feb 27, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T156/1038
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A machine for transforming heat shrinkable thermoplastic material into sealed and liquid-filled containers in which the material in strip form is cut off to a suitable length then heated and transformed into a tube-shaped shell blank on a mandrel with an overlapped longitudinal heat-sealed seam. The shell is then displaced in relation to the mandrel so that its bottom end extends beyond the end of the mandrel, a base blank cut from another strip is then inserted into the end of the shell to rest against the mandrel end, and the shell and inserted base are then heated causing the shell to shrink accurately to the shape of the mandrel and the bottom edge zone of the heated shell to be folded in against the end of the mandrel and the edge of the base. The joined edge zones of the shell and base are then pressed together and heat sealed. The container is then passed to a filling machine where it is filled and closed by a lid.