Most creases/lines in putting green materials are mainly at the edge of a roll. During manufacturing, the roll is tightly wound for packaging. When the finished product is “machine rolled,” the edge is attached to a cardboard core/tube, pushing it into the face of the putting green surface. This leaves a “crease/line.” When the rest of the roll is tightly rolled to completion, it mashes the edge that was connected to the cardboard core/tube roll. This also could be from rolls stacked on top of one another. Some crease lines may end up more into the roll. As frustrating this can be, with a little patience the crease/line can be removed.
There are many factors to consider when dealing with any imperfection in the turf surface. The crucial factor is that one must not think defibrillation is the key to making them disappear. Defibrillation (power brooming) scratches the fibers. Over power brooming and aggressively brushing turf fibers will change the dynamics of how light reflects upon them. If you scrub an imperfection in synthetic turf, it may become a “darker” color than the rest of the areas. This is due to the sunlight being halted from reflecting off the shiny blade.