PROCESS AND MOLD FOR PLASTIC PACK MOLDING

摘要

The present invention refers to a process and mold (1) for plastic pack molding by using the blow molding technique by extrusion with cavities joined by the neck by a lost-head (20). The process of the present invention basically comprises: (i) formation of parisons (13); (ii) closure of the mold (1) so that the higher (2) and lower (3) cavities are closed over said parisons (13) by pressing and welding the ends of said parisons on the regions of higher (7) and lower (8) insert; (iii) clipping the lost-head region (4) with tweezers; (iv) advance of a set of needles (11), so that all blowing needles penetrate simultaneously through all parisons included in the mold; (v) feeding of pressed air until the walls of the parisons touch the internal surface of higher (2) and lower (3) cavities; (vi) air exhaustion and opening of the mold (1) to extract the packs which are suspended by the lost-head (20); (vii) stamping of newly molded packs to take out the scraps (17) from the bottoms; and (viii) transport of the packs to a cutter, in which packs are separated from the lost-heads (20). The invention also deals with an appropriate mold (1) to be used in the process disclosed.