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My theory is that the triangular shape reduces friction when sewing very heavy canvas, thus making the work easier. Unfortunately, I cannot provide any proof for my claim. Canvas is a plain weave material. The threads form a net of regular squares. If you try pushing a round needle through it, there will be 4 threads touching the needle on all sides. And ...


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Why are needles designed for sewing thick canvas or heavy leather three-edged? The answer is quite simple. They are designed this way in order to avoid tearing leather and other thick materials. They also make hand sewing more easy by improving the needles' grip. They are called glovers, because professionals use specially designed gloves when sewing such ...


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