TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Component: The pelletizing device comprises a mold with holes having a diameter (D) of less than or equal to 14 mm and hole length (L) to hole diameter (D) ratio (R) of greater than or equal to 7, where the values of R and T1 are chosen in relation to one another so that a temperature T2 of the pellets leaving the mold is 100-125 degrees C and T2-T1 rise in temperature is greater than or equal to 10 degrees C.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: At least part of the plastic film component is converted to component D by heating the plastic film component and cellulose component in the pelletizing step for a time and a temperature such that component D comprises a composite structure derived from component B and component C. Component B is converted to component D through frictional heating from the pelletizing device, such that the temperature of the outside of the pellet exiting the pelletizing device is 100-125 degrees C. Component D is derived from the plastic film component B which is chemically bound to the cellulose component C by a chemical binding agent. The pelletizing of the feed stream forms a pellet having an outer portion and a core portion, where the pelletizing device transfers heat into the core portion such that the plastic film component B is partially fused onto the cellulose component C to produce component D in the core portion. The method further comprises testing the pellets to assess the wt.% of component B, and, if component B is above 15 wt.%, adjusting process conditions such that future pellets have a component B content of less than 15 wt.%. The method also comprises an annealing step. The pellet is ground using an air mill. Preferred Condition: The waste material stream is supplied to the pelletizing device at a temperature T1 of less than or equal to 90 degrees C. Preferred Component: The pellet comprises, relative to the total weight of the pellet, a polymer component A comprising more than 0 wt.% and less than 15 wt.% of a plastic film component B; greater than or equal to 20 wt.% of a cellulose component C; and greater than or equal to 5 wt.% of a plastic component D. EXAMPLE - No suitable example given.