Determination of modulus. Plastic parts molding surface are placed on the front mold, the diameter of the water initially set 8mm, finally determine the upper die kernel at the height of the 45.5mm (1 mm gap between the template); finally determine the mold insert size is 240mm x 245mm. general mode kernel is a screw fixation in the template, taking into account the passage placed and congeals the material removal, the design of the mould kernel are designed to be like a template thickness, between them through the battens fixed.