Method and apparatus for heat sealing a plurality of sets of continuous plastic strips together by radio frequency energy

US4295908A · kind A · utility

Assignee

• Manhattan R. F. Die Company · US

Inventors

• Hans Schaefer · Hanau, DE
• Alfred Langer · Kolbermoor, DE

Key dates

• Filing date: Dec 10, 1979
• Grant date: Oct 20, 1981
• Expiry date: Dec 10, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T156/1739
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Radio frequency heat sealing method and apparatus for simultaneously fabricating a plurality of separate items from separate sets of continuous plastic strips or sheets as these sets are indexed in unison past a heat sealing station. The technique utilizes a platen equipped with heat fusing and tear sealing dies on its opposite faces and which platen is located between separate sets of plastic strips and a pair of cooperating platens. The die equipped intermediate platen is preferably cooled to permit rapid cycling and indexing of the sets of stripping therepast.