Fusion processing of synthetic thermoplastic resinous materials

An apparatus for the fusion processing of a particulate synthetic thermoplastic resinous material comprising, means for providing a first stream of high-velocity gas;

• means for entraining the particulate synthetic thermoplastic resinous material in the first stream of gas;
• an elongated passageway for transporting the first stream of gas and entrained resinous material, the passageway being defined by at least one wall having a plurality of formamina or small pores therethrough and throughout substantially the length thereof;
• means for providing and passing a second stream of heated gas through the foraminous wall into the passageway, said second stream having sufficient velocity uniformly through the wall to provide a slip stream next to the passageway surface of the wall thereby minimizing sticking of the resinous material to the passageway surface of the wall, said wall terminating at an exit opening for expelling the first and second streams of gas and entrained resinous material from the apparatus;
• and a workpiece against which the entrained resinous material is directed, thereby fusing the resinous material.