Heat sealed,readily peelable or tearable structure suitable for closures,labels,packaging,etc.

Abstract

Abstract A CONTAINER OR TRAY, PREFERABLY FLANGED, IS CLOSED WITH A COMPOSITE PEELABLE CLOSURE SHEET HEAT SEALED THERETO, THE EMBODIMENT DESCRIBED WILL REMAIN SEALED WHEN SUBJECTED TO RANGES OF TEMPERATURES OF FROM ABOUT -40* TO ABOUT 212*F. YET, THE CLOSURE REMAINS READILY REMOVABLE, THE CONTAINER CAN BE MADE AND IS NOW PREFERRED TO BE MADE OF A HIGH DENSITY POLYETHYLENE OR A MATERIAL OF WHICH AT LEAST THE SURFACE, WHICH IS HEAT SEALED, IS MADE OF SUCH A POLYETHYLENE. THE CLOSURE SHEET OR COMPOSITE CAN BE MADE AND IS NOW PREFERRED TO BE OF A POLYAMIDE OR OTHER RELATIVELY HIGH MELTING MATERIAL, E.G., A POLYESTER. PRESENTLY A NYLON, E.G., NYLON-6 RESIN ONTO WHICH IS COATED, FOR THE HEAT SEALING THEREOF TO THE TRAY OR CONTAINER, A FILM OF A LOW DENSITY POLYETHYLENE, IS PREFERRED. THE ADHESION IS OBTAINED OR A CONTAINER IS CLOSED HERMETICALLY BY PLACING THE COMPOSITE SHEET UPON THE PORTION, E.G., FLANGE OF THE CONTAINER AT WHICH IT IS TO SEALINGLY ENGAGE THE SAME. THE LOW DENSITY POLYETHYLENE SIDE OF THE COMPOSITE SHEET IS IN CONTACT WITH THE CONTAINER AND THE HEAT SEAL THEN ENGENDERED. A PARTICULAR TYPE OF COMBINATION OF MATERIALS USED PERMITS THE FILM TO PULL CLEANLY FROM THE CONTAINER, LEAVING THE FLANGE OR OTHER SEALED SURFACE THEREOF NEAT AND IN A PARTICULAR CASE, RETAINING THE LOW DENSITY POLYETHYLENE WHICH PRODUCED THE SEAL AS A JUST NOTICEABLY BEAD-LIKE LINE ON THE FLANGE WHEN A LINE-SEAL HAS BEEN EMPLOYED. THE CONTAINER CAN BE A HIGH DENSITY COATED PAPERBOARD CONTAINER SUCH AS A MILK CONTAINER OR A BLISTER PACKAGE, ETC. ALSO THE COMBINATION OF MATERIALS CAN BE USED TO LABEL GOODS. THE USEFUL COMBINATION OF MATERIALS TO FASHION TEAR STRIPS, LBELS, ETC. IS ALSO DISCLOSED.

Inventors

• 👤 A Hurst
• 👤 S Mirasol

Bibliographic Details