APPLICATION METHOD OF SEALANT TO PIPE END CORROSION PROTECTIVE JOINT CORE PART

摘要

PURPOSE:To enable the uniform, stable application of sealant by bringing the discharge needle of a rotatable discharge needle unit into contact with the core outer peripheral surface in a joint, and in this state, discharging sealant from the discharge needle to apply the sealant to the core outer peripheral surface. CONSTITUTION:In the case of applying RTV rubber to a pipe end corrosion protective joint core part by a moisture-hardened type sealant (RTV rubber) applying device, a joint 9 is placed on a workpiece support table first. At this time, the tip part of the discharge needle of a discharge needle unit 2 is brought into light contact with the outer peripheral surface of the joint core to be fittingly inserted into a pipe end part. In this state, while rotating the discharge needle unit 2 by a motor 8 through a belt 7 or the like, RTV rubber is discharged from a RTV rubber discharge device 3, and RTV rubber in the unhardened state is applied to the joint core in wedge-shape cross section. This RTV rubber is cross-linked reacting to moisture in atmospheric air and hardened gradually so as to function as a rubber packing thereafter.