Footwear mold assembly for injection-molding

A mold assembly for injection molding, the mold assembly comprising:

• a first mold plate comprising a first mold cavity wall;
• a mold ring plate abutting the first mold plate and comprising a second mold cavity wall;
• and a second mold plate abutting the mold ring plate and comprising a third mold cavity wall, wherein:
• the mold assembly comprises a mold cavity fully enclosed by the first mold cavity wall, the second mold cavity wall, and the third mold cavity wall,
• the second mold plate comprises a first side facing towards the mold ring plate, a second side facing away from the mold ring plate, and a plate body between the first side and the second side;
• the second mold plate comprises at least one runner inlet on the second side and a single gate outlet in the third mold cavity wall;
• the second mold plate includes a first gas channel extending entirely through the plate body from the first side to the second side;
• the mold ring plate includes a second gas channel extending entirely through a plate body of the mold ring plate the mold ring plate includes a first side facing the first mold plate and a surface channel in the first side facing the first mold plate extending between the mold cavity and a second mold cavity separate from the mold cavity;
• and the mold assembly includes a vent positioned between the mold ring plate and the first mold plate;
• and wherein the second gas channel fluidly connects with the vent via the surface channel.