Hi.
The tri-fold brochure is also known as 'tryptich'
A simple web search defines it as:
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Promotional brochures come in many sizes and can be folded many different ways,
the most common being the tri-fold
brochure. This fold creates three equal sections by folding the sides over the
middle. Most tri-folds bend the right
side first and then the left so that when opened, the brochure reads from left
to right.
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If Any of You have an example. It would be nice. As the other
alternative is using a propietary tool for it :(.
Best Regards