PURPOSE: To make an initial compressive strength higher and also to prevent the compressive strength at the time of actual use from lowering by containing carbon fiber or boron fiber in a resin forming a pressure vessel and by molding the vessel.
CONSTITUTION: A pressure vessel 1, 2, which is provided within the heating chamber of an electronic oven, etc., for cooking a material to be cooked at a high temperature and high pressure, is formed by resin and carbon fiber or boron fiber is mixed in the resin. These fibers are higher in strength as compared with glass fiber and can be contained in the resin in the state of a long fiber. From viewpoints of pressure intensity and moldability, the content of the carbon fiber or boron fiber can be adjusted to 5-45% freely. Thus, it is possible to contrive to improve the compressive strength of the pressure vessel and to prevent the compressive strength lowering by a repeated use.
ITO MASAHIKO
MAKI MASAO
