When making more complex book fold designs you end up needing to make interior folds. I have already discussed how to do a triangle interior fold. If you want a flat internal folded area, you need to make a rectangular interior fold. I use these for the interior spaces of letters, and if I, like on my Star Pattern, I want the space defined by the fold to have a flat surface. There are two kinds, the simple and three-part rectangular fold. Here is a video tutorial about simple rectangular folds. You can use the simple kind for most things, but if you are making a deep or long interior fold, a three part rectangular fold gives the folded page more structure.
Rectangular internal folds
Simple Rectangular Fold
• Use the pattern to mark the top and the bottom of the internal fold
• Make two cuts into the page:
o One at the top and one at the bottom of the internal fold area.
o Cuts should be perpendicular to the outer edge of the page.
o Ensure both cuts are made to the same depth.
• Fold the resulting flap back toward the spine of the book.
Three-Part Rectangular Fold
Use this method for internal folds larger than ~1 cm.
Provides extra structural support to prevent sagging.
1. Use the ruler to mark three points on the internal fold area:
o Top, bottom, and center.
2. At the center mark, cut into the page to a depth of ½ to ⅔ of the final desired depth.
3. Make diagonal snips from the center cut to the top and bottom depth marks.
4. Fold back:
o The two side flaps created by the diagonal cuts.
o The triangular bottom flap.
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| The Star Pattern has triangle folds for the outside of the lower rays, but rectangle folds to make the inner circle shape. |
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