Process for producing infusion packets

A process for thermoforming a gas and liquid permeable layer of thermoplastic material having an average thickness of less than 0.50 mm, the process comprising the steps of bringing the layer into contact with a layer of deformable non-gas permeable material to form a separable laminate of the two materials, arranging for the thermoplastic material to be at a thermoformable temperature and thermoforming the separable laminate, thereby thermoforming the thermoplastic material, followed by the step of depositing a particulate product into the thermoformed thermoplastic material.