US PATENT SUBCLASS 264 / 900
DIRECT APPLICATION OF FLUID PRESSURE DIFFERENTIAL TO SHAPE, RESHAPE (I.E., DISTORT), OR SUSTAIN AN ARTICLE OR PREFORM AND HEAT-SETTING (I.E., CRYSTALLIZING OF STRETCHED OR MOLECULARLY ORIENTED PORTION) THEREOF

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

900DIRECT APPLICATION OF FLUID PRESSURE DIFFERENTIAL TO SHAPE, RESHAPE (I.E., DISTORT), OR SUSTAIN AN ARTICLE OR PREFORM AND HEAT-SETTING (I.E., CRYSTALLIZING OF STRETCHED OR MOLECULARLY ORIENTED PORTION) THEREOF {5}
901  DF  .~> Heat-setting of stretched or molecularly oriented article formed from planar preform (e.g., sheet, film, etc.)
902  DF  .~> Production of continuous length
903  DF  .~> Heat-setting and simultaneous differential heating of stretched or molecularly oriented section of article or preform
904  DF  .~> Maintaining article in fixed shape during heat-setting
905  DF  .~> Having plural, distinct differential fluid pressure shaping steps {1}

DEFINITION

Classification: 264/900

DIRECT APPLICATION OF FLUID PRESSURE DIFFERENTIAL TO SHAPE, RESHAPE (I.E., DISTORT), OR SUSTAIN AN ARTICLE OR PREFORM AND HEAT-SETTING (I.E., CRYSTALLIZING OF STRETCHED OR MOLECULARLY ORIENTED PORTION) THEREOF:

(under the class definition) Cross-reference art collection directed to a process under the ... wherein (a) elongation or molecular alignment of at least a portion of a workpiece occurs when positive or negative fluid pressure differential is applied through a medium of liquid or gas in direct contact with the workpiece, and the elongated or aligned portion of the workpiece is heated to stabilize the shape thereof by crystallizing; or (b) the shape of a previously elongated or molecularly oriented workpiece is maintained by application of a positive or negative fluid pressure differential while the workpiece is heated to stabilize the shape thereof by crystallizing.

(1) Note. In this subclass, crystallizing refers to the establishment of a long range order within the polymeric mass wherein intermolecular attractions (e.g., hydrogen bonding, Van der Vaal forces, etc.) stabilize the polymeric chains into a regular lattice often typified by a characteristic X-ray diffraction pattern.

(2) Note. Heat-setting improves stabilization of blow-molded or vacuum-formed articles against shrinkage or deformation when in use in an elevated temperature environment.