Quick Answer
Twisting is required for bark cordage strength because it creates a helical structure that distributes tension evenly, minimizing the risk of breakage. This twisting action tightens the fibers, eliminating gaps and preventing them from slipping. When done correctly, twisting significantly increases the cordage's tensile strength.
The Importance of Fiber Orientation
When twisting bark cordage, it’s essential to maintain the natural orientation of the fibers. The fibers should be twisted in the same direction as the growth rings of the tree. This means twisting the fibers in a clockwise or counterclockwise direction, depending on the direction of the growth rings. If the fibers are twisted against the growth rings, the cordage will be weaker and more prone to breakage. To achieve the correct orientation, strip the bark in the direction of the growth rings and then twist the fibers in the same direction.
Techniques for Achieving Optimal Twist
To achieve optimal twist, use a consistent twisting motion and maintain a steady tension. Aim for 5-7 twists per inch of cordage. This will create a robust and durable helical structure. If the twist is too loose, the fibers will not be securely locked together, resulting in a weak cordage. Conversely, if the twist is too tight, the fibers will be compacted, but the cordage will be prone to cracking. To avoid these issues, use a twisting tool or a well-worn stick to apply consistent pressure.
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