DE2037152A1 - Preformed thermoplastic insulating jacket - for tubes produced in a sheet and then cut to size - Google Patents

Abstract

A flat thermoplastic sheet is heat formed into a tube then cooled and flattened out and the flat sheet coiled into a delivery roll from which the required length for the tube can be cut off and the band automatically reforms itself into a round, endless overlapped insulating jacket round the pipe.

Description

Process for the machine production of a thermally # endless # prmten Open pipe jacket for insulated pipes and machines for carrying out the process.

The invention relates to a method, heated, thermoplastic Deformable plastic film webs are continuously machined to a length of up to Endless edged or overlapped pipe jacketing for insulated pipes to form and machine to carry out the process.

The machine is optionally available with a film extruder or calender coupled, prefabricated foil sheets wound into rolls are preferred In the machine, thermally formed into a continuous pipe coating, directly subsequently cooled back to about 20 degrees C, then via one or more pulleys and spreading device again approximately or completely flattened over the width of the film web and with sufficient winding tension back to a roll of any length wound up. The winding tension or a separately arranged pressure roller against the winding roll is adjusted so that the even regression of the open, flattened pipe is fully preserved.

This ensures that the film web is unwinding or unwinding. Pulling itself off the roll to the preformed stiff, continuously straight and portable open to overlapped tube regresses, each being the exact one Required length of the pipe sheathing is pulled off the roll and separated.

It is known that the existing longitudinal curl of a manufactured Reinforce Rolienbann, so that a short lengthwise section of the film strip can be seen in the length of an insulated pipe circumference easier to wind on the same and fasten leaves, with the length of the sheathing at most only corresponds to the width of the roll. This means that there are many parts that have to be connected together for one insulated continuous straight pipeline required.

The object underlying the invention is to be Avoidance of the defects mentioned in the sheathing of insulated pipelines made of plastic sheeting to achieve an increase in performance, an improvement in quality and a reduction in costs. This is achieved because when laying the sheathing of insulated pipes without connections and sections with continuous, undivided sheathing lengths all of any length, cables that have just been laid can be sheathed. Un + grants are only Necessary in case of pipe bends and sometimes in the case of branches or ratchet wheels.

When laying the sheathing, the role is immediately attached to the pre-insulated Pipe placed on it, continued in the longitudinal direction, whereby the open, flattened and rolled up tube when unwinding from the roll automatically for Tube regresses and wraps itself continuously around the insulated pipeline, so that only the longitudinal overlap or the longitudinal joint of the two continuous straight lines Boundary edges is connected.

An embodiment of a machine according to FIG Invention explained with reference to a schematic drawing, with only the mechanical process sequence is shown. The machine consists in the selected embodiment in the Mainly from a frame - not listed in the drawing - in which the required, devices listed in the description are installed. From the loosely stored, slightly braked supply film roll 1 becomes the flat one in the direction of the arrow Roller conveyor 2 withdrawn, over the pulley 3 in the unheated tubular molded part 4 drawn in, formed into a tube, hot-formed in the heated molded part 5 and then recooled in the cooled molded part 6; in the process, the flat film formed into the Robr becomes solidified as a tube, subsequently in the outlet of the molded part 6 at 7 with a spreader 8 spread flat and fed to the driven winding roller lo via a guide roller 9 and lying flat with a spring-loaded pressure roller 11 and suitable winding tension wound up and formed into a film roll 12.

Claims (2)

Patent claims: 1Method of machine production of round, overlapped, continuous to endless pipe sheathing made from a thermoplastically deformable plastic film web produced by heat deformation and subsequent recooling, subsequently almost flat-spread, wound into a roll of any length, thereby characterized in that when removed from the roll in pipe casing lengths as required the flat sheet continuously rounds itself up again when it is peeled off, endless, overlapped pipe casing. 2. Machine for the production of round, endless, overlapped pipe casings according to the method according to claim 1, characterized by one loose in the machine stored, slightly braked polish supply roll, from which the flat roller conveyor pulled off, over a pulley through an unheated, tubular, open and overlapped molded part drawn through, formed into an overlapped tube, further in the downstream The heated molding is hot-formed and then in the downstream cooled molding recooled and strengthened in this design as an overlapped casing, then spread it flat with a spreading device in the outlet from the Xühlformteil, fed via a deflection roller to the driven winding roller and then in the flat-spread Condition is wound into a roll.