Plastic article or earthenware shaping or treating: apparatus – Diverse distinct type shaping means – Shaping orifice and either a downstream preform reshaping...
Reexamination Certificate
2007-01-18
2010-06-22
Gupta, Yogendra (Department: 1791)
Plastic article or earthenware shaping or treating: apparatus
Diverse distinct type shaping means
Shaping orifice and either a downstream preform reshaping...
C425S363000, C425SDIG041
Reexamination Certificate
active
07740470
ABSTRACT:
A stretcher for substantially uniaxially orienting a film includes a plurality of gripping members to hold opposing edge portions of the film, paths along which the gripping members travel to stretch the film in a stretching region, and a drive mechanism to convey the film and gripping members along a machine direction. At least a portion of the paths in the stretching region define diverging, curvilinear courses disposed in-plane. The paths are configured such that during the stretching an extent of uniaxial character, U, is between zero and unity and a minimum value of an extent of uniaxial character, U, is at least 0.70 over a final portion of the stretching after achieving a TDDR of 2.5. U is defined as U=(1/MDDR−1)/(TDDR1/2−1), wherein TDDR is greater than 4 at an end of the stretching region.
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Jackson Jeffery N.
Krueger Dennis L.
Merrill William Ward
Ruff Andrew T.
Wheatley John A.
3M Innovative Properties Company
Gupta Yogendra
Luk Emmanuel S
Pralle Jay R.
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