The method of bookbinding often used to make soft cover and paperback books is called "perfect binding".
Hot Melt Glue Book Binder Perfect Binding Machine Applicator Handle
Book Binding Glue Version
Hot Melt Perfect Binding Glue 1kg – Printer's Parts & Equipment -USA
How PUR-fect is our Perfect Binding?
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Book Binding PUR Hot Melt Perfect Binding Machine Hot Melt Glue - China Book Binding Glue, Book Spine Glue
Perfect binding glue ( Tutorial on how to use )
Perfect Bound Books (glue)
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Hot Melt Perfect Binding Glue 2lb (1kg) for Perfect Binder Bookbinding
Types of Binding