Patent ID: 9466516
Filing Date: 2016-10-11
CPC Classification: B29C,F27B,F27D,H01L,H05B

Claim Text:
1. A method of manufacturing a cylindrical thermal insulation wall body having a holding unit of a heater element formed in an inner peripheral surface, the method comprising: processing a plate-shaped thermal insulation member such that a plurality of groove portions are formed at a predetermined pitch, the plurality of groove portions extending from a first surface to a second surface opposite to the first surface; processing the thermal insulation member such that an angle between either of the first surface and the second surface, and a third surface, on which the groove portions are formed and which is perpendicular to a depth direction of the groove portions, is 90+180/n degrees, wherein n is a natural number of three or larger; and manufacturing the cylindrical thermal insulation wall body by bonding a plurality of sectional thermal insulation members, wherein the plurality of sectional thermal insulation members are bonded such that the groove portions of the adjacent sectional thermal insulation members are aligned with each other and to form the holding unit in the inner peripheral surface of the cylindrical thermal insulation wall body.