Patent ID: 6054180
Filing Date: 2000-04-25
Classification: B29C,B29L,B32B

Abstract:
A method for impregnating a resin-absorbable tubular liner with a hardenable liquid resin, wherein an outside face of the resin-absorbable tubular liner is hermetically covered with a film, the method comprising the steps of:(a) preparing an air-tight hose, which has one end open and the other end in pneumatic communication with a vacuum create means;(b) bringing the open end of the hose inside the resin-absorbable tubular liner to a location substantially distant from a first end of the resin-absorbable tubular liner at which end the hose is absent, so that the tubular liner is partially penetrated by the hose;(c) closing a second end of the resin-absorbable tubular liner, through which the hose extends, in a manner such that the hose is closely contacted by the second end of the resin-absorbable tubular liner but can freely slide therethrough;(d) injecting a predetermined amount of the hardenable liquid resin into the resin-absorbable tubular liner through the first end of the resin-absorbable tubular liner, the predetermined amount being such an amount that can sufficiently soak the entire length of the resin-absorbable tubular liner;(e) closing the first end of the tubular liner after step (d); and(f) causing the vacuum create means to evacuate the hose while at the same time the resin-absorbable tubular liner is moved in a manner such that the length of the hose inside the liner is reduced.