Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1996-04-19
1998-01-20
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 403, 264 406, 264553, 425140, B29C 5100
Patent
active
057098255
ABSTRACT:
A thermoforming process window of a rectangular sheet of a thermoplastic material is determined by calculating its Sag Number during heating. The Sag Number is a function of the sheets length, width and apex depth at the center of sag. Upon the Sag Number being between 10 and 40, preferably 15 and 35, and more preferably 19 and 28, the sheet is ready for forming into an end product.
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Eashoo Mark
Eastman Chemical Company
Gwinnell Harry J.
Silbaugh Jan H.
Tubach Cheryl J.
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