Stitching Thread
A material that is used for holding together pages of a book block. Consists of strands that are twisted or stuck together. Stitching threads vary in the number of strands, material, color and formation method. Synthetic threads that may have security features (luminescence in UV and IR light, etc.) are used for stitching passports and travel documents. A stitching thread seam is a succession of stitches placed at regular intervals. Edge stitches can be sewn several times.
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b
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Fig. 1. Qatar. Travel document issued in 2016:
a — page 25. Paper substrate; b — one-color twisted stitching thread. White light; c — the same. UV light
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b
c
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Fig. 2. USA. Passport issued in 2006:
a — page 15. Paper substrate; b — two-color two-strand stitching thread. Complicated lockstitch. White light; c — the same. Zoomed fragment; d — the same. UV light
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b
c
Fig. 3. Moldova. Official passport issued in 2015:
a — page 17. Paper substrate; b — three-color three-strand stitching thread. Edge stitches are sewn twice; c — the same. UV light
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b
c
Fig. 3. Denmark. Allien's passport issued in 1993:
a — page 17. Paper substrate; b — the same. Polymer thermo stitching thread; c — the same. Zoomed fragment