A latent material having various controlled shrinkage tensions and patterns and a method of making the same. The materials include polymer materials that are capable of absorbing microwave energy. Different degrees of shrinkage of the material may be controlled to create different tensions in the material....http://www.google.com.au/patents/US6887916?utm_source=gb-gplus-sharePatent US6887916 - Materials having controlled shrinkage and patterns and methods of making same
