초록 ▼

A method is shown for forming a flange on an end of a plastic pipe liner of the type used to line a tubular member. A reinforced disc having a rigid portion and an elastomeric portion is placed about the liner exterior and moved into position flush with the flanged end of the tubular member. A retai

A method is shown for forming a flange on an end of a plastic pipe liner of the type used to line a tubular member. A reinforced disc having a rigid portion and an elastomeric portion is placed about the liner exterior and moved into position flush with the flanged end of the tubular member. A retaining ring is placed about the reinforced disc and the disc and liner exposed end are heated to render the materials malleable. A forming unit is then used to apply force to the liner to flow the liner into a reformed shape having a greater external diameter than the remainder of the liner. The forming operation also bonds the reinforced disc to the reformed liner end to further resist any tendency of the liner end to be retracted into the interior of the tubular member.

대표청구항 ▼

A method for forming a flange on an end of a plastic pipe liner of the type used to line a tubular member having opposing flanged ends, the plastic pipe liner having opposite ends at least one of which extends outwardly to be exposed from one of the opposing flanged ends of the tubular member, the m

A method for forming a flange on an end of a plastic pipe liner of the type used to line a tubular member having opposing flanged ends, the plastic pipe liner having opposite ends at least one of which extends outwardly to be exposed from one of the opposing flanged ends of the tubular member, the method comprising the steps of: installing a reinforced disc about the exterior of the exposed end of the plastic pipe liner and moving the disc into position flush with the flanged end of the tubular member, the reinforced disc having a rigid portion encapsulated within an associated elastomeric portion which is compatible with the plastic pipe liner, the reinforced disc also having a peripheral edge; installing a metallic retaining ring about the peripheral edge of the reinforced disc; heating the reinforced disc and the exposed end of the plastic pipe liner for a time and to a temperature sufficient to render the material thereof to a malleable state; surrounding the exposed end of the plastic pipe liner with a forming unit having a forming collar with a collar recess, the forming unit also having drive means for applying force to the exposed end of the liner to flow the liner into the collar recess and reform the liner material to a desired shape; and applying force to the exposed end of the plastic pipe liner with the forming unit to flow the malleable end thereof into the collar recess, the reformed liner thereby bonding to the compatible elastomeric portion of the reinforced disc and forming a seal with the metallic retaining ring.