Abstract: A method and apparatus for forming a self-supporting tray-like container wherein a product-receiving well protrudes into a second well in an all-round mutually spaced relationship. The method calls for two parts, each formed with a well therein and each part formed of a thermoplastic having a different resistance to thermal deformation, to be joined at their peripheries. The present invention additionally provides that the two parts are to be formed simultaneously, their peripheries are to be joined so that their respective wells extend in opposite directions after which one well is inverted into the other.

Abstract: A self-supporting tray-like product container (especially for food) having an inner dished part for accommodating the product in a first well, and an outer dished part having a second well into which the first well protrudes, the inner and outer parts contacting and being joined to each other at their respective peripheral edges otherwise with their wells in all-round mutually-spaced relation. The spacing provides thermal and/or shock insulation and allows the inner and outer parts to be made of different materials especially one having different thermal deformation resistances which allows use of the package in either a conventional or a microwave oven or both according to the materials chosen.