Welding Parameters - HDPE and LLDPE Textured Liner
by George Hall

Equipment Setup: Poly-Flex Models PF-90 thru PF-95
Set the cam to its proper pressure setting using the chart below. Place two sheets of liner between the nip rollers and then engage the cam. Do not let the liner interfere with the wedge. Engage the wedge up to the nip roller. The wedge should be the distance of 1-1/2 times the thickness away from the nip rollers. Also center the wedge between the nip rollers. Leave the cam engaged and the wedge set between the nip rollers. Place a piece of liner between the wedge and the upper contour rollers. The liner between the wedge and the upper contour rollers should be tight. The liner should roll with the contour rollers but not side to side. The tension has to be tight enough for the wedge to remove the texture surface and penetrate the liner core. Leave the piece of liner between the upper contour rollers and the wedge. Place a piece of liner between the wedge and the lower contour rollers. Adjust using the same method as adjusting the upper contour rollers. Be sure after making the contour roller adjustments that the wedge is centered between the nip rollers.
Remove all liner and release the wedge and the nip rollers. Turn the welder on and use the initial temperature and speed settings as shown on the following chart.

The parameters listed above are only suggested starting points to be used when making a prequalifying weld. As ambient temperatures and other weather conditions change, the welding parameters must be adjusted by the seaming operator.