Patent ID: 8657600

Claim:
A plastic material injection molding system, comprising: a feeding nozzle for feeding liquid plastic material; and a forming mold device comprising: a forming mold having a forming cavity therein; and a material-passing mold disposed between the feeding nozzle and the forming mold, and having a material-feeding runner therein in communication with both the feeding nozzle and the forming cavity, the material-feeding runner comprising: an inlet section directly in communication with the feeding nozzle; a buffer section, the inlet section being arranged between the buffer section and the feeding nozzle, and being directly in communication with the buffer section; a first bending section, the buffer section being arranged between the inlet section and the first bending section, and being directly in communication with the first bending section, a width of the buffer section being larger than a width of the first bending section and a width of the inlet section; and a second bending section, the first bending section being arranged between the buffer section and the second bending section, and being in communication with the second bending section; a U-turn section, the second bending section being arranged between the first bending section and the U-turn section, and being in communication with the first bending section and the U-turn section; and an outlet section arranged between the U-turn section and the forming cavity, and being in communication with the U-turn section and the forming cavity, wherein both of the second bending section and the outlet are connected to a same side of the U-turn section, and a caliber of the U-turn section shrinks gradually from the same side of the U-turn section towards an opposite side of the U-turn section, which is away from the second bending section.