In this process, plastic-coated thread is stitched through the spine of a signature, which is then heated to seal the thread. The result is a super-strong signature that's ready to be gathered for adhesive binding. Thread sealing can offer several advantages for your book projects:

• Strength and Durability - Thread-sealed books are comparable in strength to Smyth-sewn volumes, and significantly stronger than standard hot-melt perfect-bound books
• Spine Flexibility - Thread-sealed signatures require no milling or grind-off prior to binding, allowing books to lay flatter than perfect-bound and side-sewn volumes
• Seamless Crossovers - With no grind-off at the spine, page-to-page crossovers appear seamless
• Fast Production - Thread sealing is performed inline during folding using specialty equipment
• Cost Efficiency - By eliminating the time-consuming extra step of sewing, the efficiency of thread sealing translates into average cost savings of more than 20% compared with Smyth sewing