| 摘要 |
A hermetically sealed package and method of making the package are disclosed, wherein an extruded thermoplastic polyurethane film is extruded, cooled to a temperature of: from 40.degree.F. to 100.degree.F., placed in overlying relation with a product and bottom package-forming member, and then directly contacted with sealing portions on the bottom package-forming member, forming a hermetic seal therewith without the necessity of an adhesive or conventional heat seal technique. The seal integrity and strength can be selectively controlled and varied to range from entirely fused to readily peelable seals through the selective application of heat, during seal formation, so that the temperature of the seal interface ranges from about 75.degree.F. to 200.degree.F. and preferably is within the range of 90.degree.F. to 175.degree.F. |
