Process and machine for multi-color injection molding

A multi-color injection molding machine comprising:

• at least three injection units for injecting three different molten resins;
• a molten resin mixing manifold around which said at least three injection units are disposed, said molten resin mixing manifold having resin passages communicated through the medium of check valves with respective nozzles of respective injection units, and a temperature at said molten resin mixing manifold being controllable;
• an arranging chamber removably built in said molten resin mixing manifold and having a gathered resin channel at which said respective resin passages join each other;
• a stationary mold attached to said molten resin mixing manifold and having resin passages communicated with said gathered resin channel of said arranging chamber;
• a movable mold adapted to reciprocate in an opposed relation to said stationary mold and having a cavity adapted to communicate with the resin passages in said arranging chamber when mated with said stationary mold;
• and
• an injection control means for controlling the sequences of injection of molten resins from said at least three injection units individually and independently but under precise correlative control.