The invention relates to a book block for a book-type document (11) with a plurality of superimposed data pages (18) which are connected to one another and at least partially along a folded edge (34) and on both sides to the folded edge (34). and extending at least in sections in a direction transverse to the folded edge (34) along the data side (18), which is arranged on a rear side of an outermost data page (18), wherein the carrier (25) of at least one plastic film (31, 32) of a thermoplastic polymer, and the backing (25) is cooled in the folded assembly (29) to a temperature below the glass transition temperature after a heat treatment of the backing (25) at which heat is applied above the glass transition temperature of the thermoplastic polymer of the backing (25) is.
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