Patent ID: 8359742
Filing Date: 2013-01-29
Classification: F16J,Y10T

Abstract:
1. A production method of an annular gasket comprising a metal base and an elastic seal layer laminated to each side thereof, comprising the steps of; subjecting a metal sheet to a punching out process to obtain a plurality of divided constituent members, each of said divided constituent members having a slightly wider width than a width of said annular gasket to be produced and a predetermined shape for constituting an annular shape, butting these constituent members to temporarily configure said annular shape and bonding the butted parts to each other by welding to form an annular object, subsequently carrying out an elastic seal layer laminating by attaching an elastic compound material to both sides of said annular object to form elastic seal layers after smoothing is performed by applying a pressurizing process to the welded parts of said annular object with a pressing machine in order to lose the unevenness made in the process of welding and punching a given shape out of said annular object to obtain said annular gasket.