method and apparatus for blow molding plastic articles from preformed parisons by reheating the parisons and then stretching and blowing them . the parisons are conveyed in series to a plurality of fixed heating stations at which the parisons are fixedly positioned for heating , the parisons being rotated for uniform heating . the heating is enhanced by blowing air under pressure through a tunnel enclosing the successive heating stations . finally , the parison is stretched and blown at a blow station in a blow mold of unique design .