I used to work in a cabinet shop that churned out countertops by the truckload. We used this simple jig to keep plastic laminate from lifting during the cut or from slipping under the saw’s rip fence, since most fences rest slightly above the saw’s table.
The jig is a simple box that fits snugly over the saw’s fence and is clamped or screwed in place. A subfence and a piece of plastic laminate glued to the bottom of the box arm corral the piece of laminate that’s being cut. To set the fence when using the jig, simply add the 3/4-in. thickness of the box arm to the overall width.