Recently , the complicated shape molds can be manufactured at a shorter production time and Iower cost by rapid tooling( RT )technology. Additionally , in injection molding , the air vent system using porous material is known as eflbctive way to exhaust gas pressed into mold and improve the burning and short shot ofmolded components . Thereat , app } ying that air vent system to injection molds manufactured by RT technique is now expected . in this report , the fabrication of air vent structure which is obtained by an additive manufacturing system i s proposed , The influence of Iaser conditions on the porosity and the permeability ofthe consolidated structure are investigated expel ' imentally , As a res 山 , the porosity and permeability are increased relative to iaser scan speed . The porous part of sintered structure becomes permeable over 25 % ofthe porosity .
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