Machine installation for the production of thick-walled insulating pipes of foam synthetic resin sheets

A machine installation for the manufacture of a thick-walled insulating pipe of elastic, laminatable foamed synthetic resin sheet material, which comprises an apparatus for the lamination of the foamed synthetic resin sheet material during winding of the sheet material on a mandrel to form a multilayer insulating pipe having a length corresponding to the sheet width of the sheet of foam material, said apparatus comprising an expandable and rotatable mandrel equipped with a pneumatic tensioning means and an infinitely variable drive mechanism for rotating the mandrel to wrap the sheet material thereon, and a pressure roller which can be urged against the mandrel, this roller being movable pneumatically by means of a telescopic holder, the mandrel being associated with a pivotably mounted burner means for flame laminating the wraps of the sheet of foam material together to form a laminated sheet pipe product and a cutter for separating the pipe product from the non-laminated sheet material, and a means for finishing the initially formed pipe product comprising a shaft rotatable in timed segments with clamping jaws being capable of receiving an unfinished insulating pipe product and being opened and closed pneumatically, wherein one holding arm is associated with a band cutter for trimming the end faces of the insulating pipe product, and a further holding arm is associated with a blade for slitting the insulating pipe along its length.