Fin Seal Container and Method

A method for assembling a fin seal container comprising the steps of:

• folding a container blank into a three-dimensional body that defines an internal volume and includes an end portion that defines an opening into said internal volume, said end portion including a first fin seal panel having an extension portion, a pre-formed fold line, an inner major surface and an outer major surface and a second fin seal panel having inner and outer major surfaces, wherein said inner major surface of said first fin seal panel and said inner major surface of said second fin seal panel are coated with a heat-sealable material;
• folding said end portion such that said inner major surface of said first fin seal panel is positioned adjacent to, and in generally parallel alignment with, said inner major surface of said second fin seal panel;
• engaging said extension portion to pivot said first fin seal panel about said pre-formed fold line away from said second fin seal panel;
• after said engaging step, heat-treating at least one of said inner major surface of said first fin seal panel and said inner major surface of said second fin seal panel;
• and
• after said heat-treating step, pressing said first fin seal panel into engagement with said second fin seal panel.