Abstract: A process cartridge recycling method which includes a water washing step, which washes a used process cartridge using water. In this step, so as not to cause deterioration of a working environment of washing, a casing of members which structure the process cartridge is extracted, and water is sprayed at the casing for washing. Also, a process cartridge recycled by this method, and a process cartridge recycling device which implements this method.

Abstract: A method of dissolving a rubber continuously to form a raw material for the production of rubber-modified polymer, by dissolving a rubber in a monomer liquid dissolving the rubber and capable of reacting with the rubber in the presence or absence of a solvent. Pieces of rubber are fed continuously to a dissolution tank to allow the dissolved rubber and the undissolved rubber to coexist in the dissolution tank, wherein the concentration of the dissolved rubber is the concentration at which the feeding to the reactor is made, and the quantity of the undissolved rubber present in the dissolution tank is at most the quantity that prevents pieces of the undissolved rubber from sticking to one another to form larger rubber masses. The time required for dissolution can be shortened, and the size of a dissolution tank can be made smaller, compared with the conventional methods.