Method for injection molding of high quality parts

A method of injection molding thermoplastic parts, said method comprising the steps of:

• providing a movable mold half to be mounted on a movable platen of an injection molding machine, said movable mold half including a B-half parting line plate and at least one movable mold insert surface thereon;
• providing a stationary mold half to be mounted on a stationary platen of the injection molding machine, said stationary mold half including a hydraulic cylinder plate which is configured to be fixedly attached to the stationary platen, at least one stationary mold insert fixedly attached to the hydraulic cylinder plate, and an A-half parting line plate movable with respect to said hydraulic cylinder plate by a moving device, said moving device linearly varying a distance between the A-half parting line plate and the hydraulic cylinder plate, wherein a movement of the A-half parting line plate is controlled by a control circuit;
• attaching the movable mold half to the movable platen of the injection molding machine;
• attaching the hydraulic cylinder plate of the stationary mold half to the stationary platen of the injection molding machine;
• extending the moving device of the stationary mold half so that the A-half parting line plate is extended by a predetermined distance away from the hydraulic cylinder plate;
• moving the movable platen of the injection molding machine toward the stationary mold half until the B-half parting line plate contacts the A-half parting line plate, thereby creating an expanded mold cavity between the at least one movable mold insert surface and a surface of the at least one stationary mold insert;
• injecting a predetermined percentage of an injection shot of molten material into a runner system formed by the movable mold half and stationary mold half, said predetermined percentage of the injection shot traveling through the runner system and into the expanded mold cavity,
• further moving the movable mold half in such a way as to decrease the predetermined distance between the A-half parting line plate and the hydraulic cylinder plate;
• and
• injecting a remaining percentage of the injection shot into the injection cavity, wherein upon completion of the movement of the movable mold half the injection cavity has reached a final cavity size, and the mold insert surfaces have reached a final clamp position;
• cooling the molten material in the mold cavity;
• and
• removing a molded part from the injection cavity.