JPS5686727A - Preparation of cylindrical body - Google Patents

Abstract

PURPOSE: To continuously obtain a cylindrical body of a good quality useful for a wave guide, etc. by a method wherein a laminated tape installed with a thermoplastic synthetic resin layer on a plane of a metallic tape is formed into a drum type by using a cylindrical molding die installed with a mold releasing layer on a contact part, and thereafter, duplicated parts of tape are welded.

CONSTITUTION: A molding die 46 is prepared which has both end parts 41, 42 of a diameter approximately as long as the inner diameter of a cylindrical body to be prepared, an intermediate part 43 less than the outer diameter having the both end parts 41, 42 and a small friction coefficient mold releasing layer 45 such as teflon on the external surface of the both end parts 41, 42. Next thereto, at least, on a plane of a metallic tape, a laminated tape installed with a thermoplastic synthetic resin layer is formed into the cylindrical body by using a molding device 4 in order to enclose the surface of a large diameter part 41 at an end of the molding die 46. Next thereto, using the welding device 6, the resin at the duplicated part of the laminated tape is welded by means of a heating means such as a hot jet 61 arranged at the intermediate part 43 of the molding die 46, and it is applied with pressure through a large diameter part at the other end 42 of the molding tool 46, and further, it is welded to obtain a drum type body.

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