Abstract: Product made using a mass that includes natural polymers, wherein the product has at least a first product part connected by a hinge construction to a second product part, wherein the hinge construction has at least one flexible sheet element and at least one bridge portion made of the mass that includes natural polymers, wherein the hinge construction is designed such that, prior to a first time hinging, the at least one bridge portion forms a more rigid connection between the first and second product parts than the flexible sheet element and by hinging the bridge portion is severed, such that the first and second parts are substantially only connected by the at least one flexible sheet element.

Abstract: A method for manufacturing sustainable products with a blown, foam structure, wherein a mass comprising at least natural polymers such as starch is passed under pressure into a mold cavity (4) or through a mold die, and the mass is heated in the mold in a manner such as to stabilize the foamed structure to form the product, wherein the method comprises prefoaming of the mass prior to injection in the mold. Preferably, the prefoamed mass is kept under pressure until insertion in the mold. The invention further relates to an apparatus to be used in said method.