Sealing of container closure

US4860902A · kind A · utility

Assignee

• Elopak AS · NO

Inventor

• Wolfgang Kieser · Zörbig, DE

Key dates

• Filing date: Aug 11, 1988
• Grant date: Aug 29, 1989
• Expiry date: Aug 11, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S53/02
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A spouted, gable-topped carton has its top closure fin sealed by welding employing an ultrasonic horn and an anvil giving a suitable profile of contour sealing of the fin. There is a straight continuous lengthwise seal where the fin is two-ply and a meandering continuous lengthwise seal where it is four-ply, while the sealed portions of the four-ply spout part of the fin are of lesser total extent in proportion to the area of that spout part than are the sealed portions of the other four-ply part of the fin in proportion to its area.