Continuous process for producing foamable celluloid

A process for preparing foamable celluloid comprising:

• introducing into an automated machine a celluloid composition comprising nitrocellulose, camphor, blowing agent, and at least one volatile liquid, wherein the automated machine comprises an enclosed, temperature-controlled chamber, comprising at least one rotor shaft along the interior longitudinal axis of the enclosed chamber, and wherein the rotor shaft comprises at least one mixing element fixed to the shaft and wherein a continuous, partially filled volume is maintained throughout the chamber;
• mixing the celluloid composition to obtain a homogenous mixture with the at least one mixing element and removing the at least one volatile liquid of the celluloid composition;
• and
• discharging foamable celluloid from the chamber;
• wherein the celluloid composition is subject to non-pressurized conditions in the temperature-controlled chamber.