Method of designing a heat seal width

Details Method of designing a heat seal width Method of designing a heat seal width

2005-10-11

2005-10-11

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Sheet, woven fabric or fiber

C073S828000, C073S834000, C073S838000, C073S807000, C073S588000

Reexamination Certificate

active

06952959

ABSTRACT:
This invention provides a method of designing a suitable heat seal width which is more resistant to unsealing than conventional heat-sealing, which involves the steps of; (1) heat-sealing a test piece of a sheet to be heat-sealed at a temperature lower than the fusion temperature of a heat seal portion of the sheet, (2) heat-sealing another test piece of the sheet at a temperature at or higher than the fusion temperature, (3) pulling to peel a heat-sealed portion of each test piece, and measuring the pull strength variation with peel length, (4) calculating the peel energy in various peel length as of the test piece heat-sealed at a temperature lower than the fusion temperature of the heat seal portion of the sheet by integrating the pull strength variation, (5) calculating the peel energy of the test piece heat-sealed at the temperature at or higher than the fusion temperature by integrating the pull strength variation up to rupture at a heat-sealed portion, and (6) setting the heat seal width at a peel length having a peel energy higher than the peel energy of the test piece heat-sealed at the temperature at or higher than the fusion temperature.

REFERENCES:
patent: 4550613 (1985-11-01), Lehtikoski et al.
patent: 4979394 (1990-12-01), Higo et al.
patent: 5527622 (1996-06-01), Kato et al.
patent: 6568533 (2003-05-01), Tanaka et al.
patent: 6689177 (2004-02-01), Sugiyama et al.
patent: 2002/0151438 (2002-10-01), Mihara et al.

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