KNOB AND MOLDING METHOD THEREOF

PURPOSE:To move a weld line to a visually unimportant position of a product when a slide knob is produced by injection molding by changing the generating position, the state, the length, of the weld line. CONSTITUTION:In the section of the weld line generating portion to a knob A, the thickness alpha of the part flowing in from a gate 6 is thicker than the thickness beta of the opposite part, the thickness gamma of the side is given as the medium between them in order to enable the molding material to flow finally into the part of thickness beta. In order to make the mixed molding material easy to move from the gate 6 to the upper and top surfaces, the root of the core 5 and the corner of the opposite cavity 4 are to be finished with a comparatively large roundness R or to be chamfered 9, 10 and a corner radius R is given also to the tip of the core 5 and the molding material flowing into the top surface is reached quickly to the end and the side of the upper surface on the part of thickness gamma.