Abstract: A thermoforming method and objects prepared using the thermoforming method are described. Non-self-supporting, polymeric films are initially formed into a three-dimensional shaped film on a male mold and then transferred to a female mold while being supported by the male mold. The three-dimensional shaped film can be further thermoformed, reinforced, or a combination thereof on the female mold. The resulting object has a substantially uniform thickness across a major surface. The method can preserve the surface quality of the polymeric film used to prepare the three-dimensional objects.
Type:
Grant
Filed:
December 31, 2002
Date of Patent:
March 24, 2009
Assignee:
3M Innovative Properties Company
Inventors:
Daniel E. Meyer, Karen J. Calverley, Paul S. Engelen, Michael A. Johnson