| 摘要 |
<p>In a mold for injection molding and controlling the dimensions of a hollow plastic product having side walls, in which a first mold part and a second mold part define a mold cavity therebetweeen, encompassed by a parting line, for forming the hollow plastic product, and further define a gate (17) for admitting molten injected plastic into the cavity; one of the mold parts (11) includes a retractable portion (12) adjacent to the gate (17); and the mold parts define primary flow channels (23) extending from the gate, which, when the retractable portion of the one mold part is protracted, direct initially injected molten plastic from the gate to create stabilizing regions (25) of stiffened plastic, to thereby impede lateral deflection of the mold parts with respect to each other when additional molten plastic subsequently is injected; whereby the side walls of the molded plastic product are uniformly dimensioned. The one mold part (11) further defines secondary flow channels (27), which are significantly thicker than adjacent portions of the mold cavity; which are adjacent to the gate (17) but, when the retractable portion is protracted, are isolated from the gate by the retractable portion (12); which are interposed between the primary flow channels (23); and which, when the retractable portion (12) is retracted, direct the subsequently injected molten plastic between the stabilizing regions (25) of stiffened plastic and into the side-wall-defining region (29) of the mold cavity.</p> |
