Stripped Boxes A Strap is a long ribbon or flap that is used for various purposes in different industries. They are used in clothing, bags, buckles, etc. They also find a great application in the packaging industry to package different boxes or parcels. The process of making strap is somewhat complicated. For example, the making of polyester (PE) strap requires the following processes. First of all, a sheet of polyester is stretched to a great extent. The final ratio of the stretch is 5:1. It must be noted that during the process of stretching, the temperature of the stretch is raised for some time to increase the strength of the strap. After this, the strap surface is treated so that the brittleness of the strap can be reduced and the weldability can be enhanced. An important part of this treatment is flattening of the strap profile. In this way, the polyester (PE) strap is made.