MANUFACTURE OF SPEWLESS RUBBER OR PLASTIC MOLDED ARTICLE AND MOLD TO BE USED THEREFOR

PURPOSE:To enable to extend a cleaning cycle and to perform smooth release of air in a mold, by a method wherein a permeable porous layer is formed at least on a part of the surface of a mold body and permeable heat resisting resin layer is formed by covering the porous layer. CONSTITUTION:A permeable porous layer 2 is formed favorably as a spray coating layer through spraying of a powdery and granular article. A thickness of a hear resisting resin layer 3 is normally 5mum-1mm. which is favorably 10mum- 0.1mm.. When the thickness of the heat resisting resin layer 3 is thinner than 5mum the layer 3 is inferior in durability and when it is thicker than 1mm., an occasion wherein favorable pin hole becomes difficult to obtain is generated. When a desirous molded article is molded by supplying a rubber or plastic molding material within the mold, by forming the heat resisting resin layer 3 having either a pin hole or a hair crack above the porous layer 2 having permeability to be molded on a mold body 1, air in the mold is released into the permeable porous layer 2 through either the pin hole or the hair crack of the heat resisting resin layer 3 and a spewless molded article whose appearance is favorable is obtained.