Injection molding alignment steering utilizing sequential throttles in base-wall-section flow guides

A mold for injection molding a plastic product having a base wall and a sidewall, comprising:

• mold parts for shaping a mold cavity for forming the product and a gate from which fluid plastic material can be injected into a base-wall section of the mold cavity;
• wherein the base-wall section includes at least one flow guide for conducting said injected plastic material through the base-wall section and thence into a sidewall section of the mold cavity;
• and
• wherein the mold parts include a first mold part that includes a row of recesses and a second mold part that includes a row of recesses that are partially opposed to the row of recesses in the first mold part to shape a portion of a given said base-wall section flow guide when the first and second mold parts are combined in opposition to one another with the recesses in the first mold part being so staggered with respect to the recesses in the second mold part as to provide a chain of overlapping recesses that form a sequence of variable-opening throttles having openings that can vary within the given flow guide whenever the alignment between the combined first and second mold parts varies in response to variations in the thickness of a region of the sidewall section into which injected plastic material is conducted from the given flow guide so that upon an increase in the thickness of said region the openings of said throttles in the given flow guide decrease and so that upon a decrease in the thickness of said region the openings of said throttles in the given flow guide increase.