Patent ID: 8168839

Claim:
A method of continuously cracking waste rubber and/or plastics, comprising: at least partially extruding raw materials comprising waste rubber and/or plastics, with a catalyst, via an air-separating and/or oxidization-preventing material feeding unit comprising an extrusion unit and a feeding pipe connected to a cracking chamber, the extrusion unit further comprising a screw conveyor unit having a variable pitch and causing extrusion while propelling, wherein the screw conveyor unit includes a screw located in the feeding pipe, and the screw does not extend as deeply into a cracking chamber as does an end of the feeding pipe, such that there is a cavity formed by space between the end of the feeding pipe and an end of the screw; transporting the at least partially extruded raw materials into the cracking chamber via the material feeding unit, wherein the screw conveyor unit and the cavity operate to reduce an amount of air and/or oxygen reaching an interior of the cracking chamber; causing said raw materials to be moved from an inlet orifice of the cracking chamber to a discharge hole, during which cracking is performed; and discharging the products through the discharge hole.