packaging material and / or insulating sheet, METHOD AND machine corresponding

The invention relates to a packaging material and / or insulating sheet (1) biodegradable, foamed and formed from at least one product of vegetable origin and at least a plasticizer, said material (1) being characterized in that said at least one plasticizer comprises at least water and confers to said material (1) forming properties by a thermoforming process. Packaging materials and / or insulating sheet.