Seal girding a stick of pipe or a pipeline in the entry or exit ports of a pipe fusion chamber

摘要

A seal (10) obstructs the migration of particulates and precipitation into a pipe fusion chamber through its pipe stick entry and pipeline exit passages. Sheets of cloth (21) serially overlap the anticipated center axis of a pipe stick/pipeline which will pass through the machine. The outer edge (23) of each sheet is pleated and fixed to a frame (11) contiguous with the perimeter of the passage (E