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AssigneeAgru/America, Inc.
InventorGunther Niedermoser
Estimating the term…
An apparatus is provided for forming recesses in a calender roll. The apparatus includes a rotational drive for rotating the calender roll around a rotational axis. The apparatus further includes a knurling wheel with knurling spikes projecting there from. The knurling wheel is rotatable about an axis that is aligned an acute angle to a plane that contains the rotational axis of the calender roll so that the knurling spikes produce a helical array of recesses in the outer surface of the calender roll. The calender roll then can be used to form a landfill liner with projections that are offset from one another to avoid having the projections form grooves and thereby preventing slippage of the landfill liner.
An apparatus for forming recesses in a calender roll, the calender roll having a longitudinal axis and an outer circumferential surface concentric with the longitudinal axis, the apparatus comprising:
A calender roll having a rotational axis and an outer circumferential surface concentric with the rotational axis, the outer circumferential surface having a plurality of recesses arranged in a helical array on the outer circumferential surface of the calender roll.
A method for forming a calendering surface on a calender roll, the method comprising:
A landfill liner formed from a sheet of resin and having a first surface for facing a ground surface of a landfill site and a second surface opposite the first surface, the landfill liner having opposite first and second side edges spaced apart in a lateral direction and opposite first and second end edges intersecting the side edges, the first surface of the landfill liner being formed with a plurality of projections arranged so that the projections form rows angularly aligned to the first and second side edges at an acute angle.
Dependencies are inferred from the claim text.