How to Form a Crease in Plastic Sheet

Plastic sheets serve to protect surfaces, keep out moisture and create a range of home and garden projects. To form a crease so you can shape a plastic sheet for a specific purpose, use the techniques used in packaging. The cardboard carton came about by accident, according to Ohio State University's "History of Packaging" fact sheet. A metal ruler created an effective crease that allowed the carton shape. to be formed. The same method works on plastic sheeting.

• 1

  Score thick plastic first, the entire length of the desired crease. A large nail works well for this. An awl or dull utility knife will work if you're careful with the pressure. The objective is to create a deep scratch without cutting through the plastic sheet.

• 2

  Turn the plastic sheet over if you scored it. Set the desired crease along a table with a square edge. Alternatively, use a square workbench or large board supported on a strong surface. Press a metal ruler along the plastic sheet in the desired location for the crease. Press hard.

• 3

  Lift the plastic sheet and check the crease. For a sharper crease, set the plastic sheet back down and press the ruler along the plastic again.