CYLINDER, MEDICAL SOLUTION INJECTION IMPLEMENT PROVIDED WITH THE CYLINDER, MOLD FOR THE CYLINDER, AND MANUFACTURING METHOD OF THE CYLINDER USING THE MOLD

摘要

PROBLEM TO BE SOLVED: To control the variation of the inner diameter of the molded cylinders while maintaining a good mold releasability during injection molding.;SOLUTION: A first clearance t1 is set to be smaller than a second clearance t3. The relationship between the first clearance t1 and the second clearance t3 is determined in a way that based on a molding shrinkage factor P specific to the kind of the synthetic resin material, a draft tapered surface is formed starting from the portion having a first design diameter ψXa to the portion having a second design diameter ψYa before the shrinkage. After molding takes place, the inside surface of the cylinder barrel roughly constitute a cylinder surface with its axis line as the center.;COPYRIGHT: (C)2008,JPO&INPIT