When constructing polyester jackets, you will need a straight-edge, a bone folder, and either scissors or a mat knife. Cutting and creasing can be done on a self-healing mat or on a large piece of mat board or binder's board. Polyester has a smooth surface and care must be taken to make sure that the book does not shift, especially while being measured. Figure 5. . Repeat step four.
Broken lines represent creases.
When creasing the polyester, place the straight-edge on the film with its edge next to, but not covering, the two dents to be used as guides. Create a crease by pressing down on the point of the bone folder while pulling it along the edge of the straight-edge. The straight-edge should be held down firmly to prevent slippage. Cut as shown in figure 9. Unbroken lines represent cuts.