Gaseous restraint of conveyed articles

Claim 1

IN A METHOD OF THERMALLY TREATING LIGHT-WEIGHT MOULDED PULP ARTICLES; THE STEPS OF TRANSVERSING THE ARTICLES ON A PERFORATE CONVEYOR, WITHDRAWING GASEOUS MEDIUM FROM A SUCTION ZONE AT THE SIDE OF SAID CONVEYOR REMOTE FROM SAID ARTICLES TO ESTABLISH A PRESSURE DROP ACROSS SAID CONVEYOR, DIRECTING A PLURALITY OF STREAMS OF GASEOUS MEDIUM TOWARDS ARTICLES ON THE CONVEYOR SO AS TO IMPINGE THE ARTICLES AT HIGH VELOCITY WHEN OPPOSITE SAID SUCTION ZONE, WITHDRAWING AT THE ARTICLE SIDE OF SAID CONVEYOR GASEOUS MEDIUM SO DIRECTED AND CIRCULATING SAID WITHDRAWN GASEOUS MEDIUM ALONG AN ENDLWSS PATH OF WHICH A PORTION IS OCCUPIED BY SAID HIGH VELOCITY STREAMS, IMPARTING HEAT TO SAID GASEOUS MEDIUM BEFORE DIRECTING IT TOWARD SAID ARTICLES, ADDING GASEOUS MEDIUM WITHDRAWN FROM SAID SUCTION ZONE TO GASEOUS MEDIUM IN SAID ENDLESS PATH, AND ADJUSTING THE RATE OF WITHDRAWAL OF SAID GASEOUS MEDIUM FROM SAID SUCTION ZONE TO BE SUFFICIENT TO RESTRAIN SAID ARTICLES FROM DISPLACEMENT ON SAID CONVEYOR BY SAID HIGH VELOCITY STREAMS.