Weld seam applicator

A well known pipe coating method is using extruded polyethylene or polypropylene to coat the pipe together with one or more additional coatings to provide weight or anti-corrosion properties to the pipeline. It is  generally assumed that the coating ofpipes with extruded polyethylene results in a uniform thickness circumferentially and longitudinally over the pipe body.

This seems to be a reasonable assumption, taking into account that three main factors governing the thickness of the application are mechanically controlled and should remain constant. Theoretically the waste percentage of applied polyethylene should be very close to zero, but experience shows it can depend greatly on the degree of accuracy of the conveyor adjustments and certain other factors, the most crucial of which is the pipe weldseam.

The thickness of coating on the weldseam, as opposed to a point perpendicular to the seam, will most certainly vary; the lowest measurement will be found on the weld. The degree of difference between the two measurements depends primarily on the height and width of the weld.

To tackle this problem, thecniques have been developed which vary the flow of material onto the pipe, increasing the flow as the weld passes the extruder head and subsequently decreasing the output on the pipe body. Extruplast now solves all the problems around weld seams with their new WSA.

It is clean, leak free, accurate and has a very precise stroke adjustment.

The stroke timing is very easy to adjust.

The Weld Seam Detection System is state of the art, working with two lasers(normaly only one laser is used).