Patent Number: 6,293,014

Title: Method for making a fixation roller

Abstract: The present invention relates to an improvement in a fixation roll consisting of several heat pipes embedded in the thick wall of the hollow cylindrical core in the axial direction, and features the fact that each of the heat pipes consisting of a copper tube and encapsulated water as the operating fluid is heated to allow the water as the operating fluid to evaporate to generate pressure and cause the heat pipe to expand and tightly fit onto the inner wall surface of the cylindrical bore in the core so as to form an integral and monolithic structure comprising the heat pipe and the core. Since the heat pipe is firmly fitted to the inner wall surface of the cylindrical bore in the core, a high quality fixation roll exhibiting a uniform surface temperature distribution is provided. Since the installation of the heat pipe is effected by means of the tube expansion, no strict dimensional control of the diameters of the bore for inserting the heat pipe as well as the heat pipe is required.

Inventors: Kitazawa; Kesaaki (Mishima, JP), Takasu; Shigetoshi (Tokyo, JP), Chinen; Takehiro (Aichi, JP)

Assignee: Nitto Kogyo Co., Ltd.

International Classification: F28D 15/02 (20060101); B23P 015/00 ()

Expiration Date: 09/25/2018