INJECTION MOLDING METHOD FOR CERAMIC PRODUCT

PURPOSE:To have weld lines removed from inside a molded product by injecting a compound in a cavity from the direction orthogonal to the line of pins running through the inside of the cavity for the purpose of forming open sections of a ceramic product and further providing a dummy section in the deepest part in the injection direction. CONSTITUTION:A cavity 2 formed in a mold 1 consists of a gate section 3, a product 4 and a dummy section 5, and a number of pins 6... for forming the holes of the product are set running through a product section 4. The pins 6... are disposed in two lines l, l, and respective line l is constituted rod a dozen of pins 6... The interval T1 between the lines l, l is 2.0mm at both ends, and the interval T2 between pins 6, 6 is 0.2mm, to be arranged particularly with the axial line C of a gate section 3 and the line l are crossed at right angle. Although when compounds are started to be injected in the cavity, weld lines 15 are generated between the pins 6, 6, and said weld lines 15 are moved to the dummy section 5 in accordance with the flow of the component, and weld lines are not left in the inside of the product.