Patent ID: 6916438

Claim:
A method of forming polymer material, said method comprising the steps of: providing polymer material having first and second surfaces; imparting a first configuration to the first surface of the polymer material; and thereafter imparting a second configuration to the second surface of the polymer material, the second configuration comprising an altered version of the first configuration; the first and second surfaces being substantially parallel to one another prior to said step of imparting the first configuration to the first surface; the second configuration comprising a mirrored version of the first configuration with respect to a central longitudinal axis between the first and second surfaces; said step of imparting a first configuration comprising: providing a mould adapted to impart the first configuration to a surface; heating the polymer material in preparation for the mould; imparting the first configuration to the polymer material via the mould; and removing the polymer material from the mould; said step of imparting a second configuration comprising: cooling the polymer material subsequent to removal of the polymer material from the mould; thereafter rendering the second surface substantially planar; and thereafter reheating the polymer material, whereby the first surface is rendered substantially planar and the second configuration develops at the second surface.