| 主权项 |
1. An injection blow molding process comprising:
(a) injection molding a polyolefin resin at an injection station to form a plurality of parisons, wherein said injection station comprises a split parison mold assembly shiftable between an open position and a closed position, wherein said split parison mold assembly presents first and second parison cavity surfaces that, when said split parison mold assembly is in said closed position, cooperatively define a plurality of parison cavities within which said resin is received; (b) simultaneously with step (a), passing a heat transfer fluid through a plurality of heat transfer channels defined within said injection station so as to regulate the temperature of at least a portion of said parison cavity surfaces, wherein each of said parison cavity surfaces comprises a neck-forming surface for defining the exterior shape of the necks of said parisons and a body-forming surface for defining the exterior shape of the bodies of said parisons, wherein during said injection molding the surface temperature of at least 70 percent of the total surface area of said body-forming surfaces is maintained within 20° F. of a target body surface temperature; (c) transferring said parisons from said injection station to a blowing station; and (d) blow molding said parisons at said blowing station to form a plurality of molded articles, wherein said passing of step (b) includes passing at least a portion of said heat transfer fluid through heat transfer channels defined within first and second die sets of said injection station, wherein said split parison mold assembly is coupled to said first and second die sets. |
