Package and method of making same

Abstract

Abstract A HERMETICALLY SEALED PACKAGE AND METHOD OF MAKING THE SAME WHICH INCLUDES A BREADAWAY OR PEELABLE SEAL FORMED BETWEEN THE RESPECTIVE SEAL FORMING SURFACES OF FIRST AND SECOND SHEETS OF PACKAGING MATERIAL. THE FIRST SHEET OF PACKAGING MATERIAL INCLUDES A SEAL FORMING SURFACE WHICH CONSISTS ESENTIALLY OF A SARAN FILM OR COATING HAVING A SUITABLE OXYGEN BARRIER FILM, FOR EXAMPLE, A SARAN FILM OF 85% VINYLIDENE CHLORIDE AND 15% VINYL CHLORIDE, ADHERED TO THE SURFACE OF THE SARAN FILM OR COATING WHICH IS OPPOSITE ITS SEAL FORMING SURFACE. THE SECOMD SHEET OF PACKAGING MATERIAL HAS A SEAL FORMING SURFACE WHICH CONSISTS ESSENTIALLY OF AN ETHYLENE-POLAR MONOMER COPOLYMER FILM OR COATING, FOR EXAMPLE, AN ETHYLENE-VINYL ACETATE FILM OR COATING, HAVING A METALLIC FOIL, FOR EXAMPLE ALUMINUM FOIL, ADHERED TO THE SRUFACE OF THE ETH- YLENE-POLAR MONOMER FILM OR COATING WHICH IS OPPOSITE ITS SEAL FORMING SURFACE. THE FOIL LAMINA IS, IN TURN, ADHERED TO A SUITABLE BACKING MEMBER, FOR EXAMPLE A SHEET OF PAPER BOARE OR SIMILAR MATERIAL. PREFERABLY, DURING SEAL FORMATION, THE SEAL INTERFACE IS HEATED TO A TEMPERATURE BELOW THE MELT TEMPERATURES OF THE FILM MATERIALS WHICH MAKE UP THE SEAL, FOR EXAMPLE FROM 80*F. TO 200*F., TO PROVIDE IMPROVED SEALING WITHOUT DESTROYING THE BREAKAWAY PROPERTY OR PEELABILITY OF THE SEAL SO FORMED.

Inventors

• 👤 P Grindrod
• 👤 H Radloff
• 👤 O Seiferth
• 👤 R Goller

Bibliographic Details