Helpful Hints

PUR Adhesive Binding Can Take It


The word is out. PUR (polyurethane reactive) is hands down the best glue for adhesive binding. For durability, nothing comes close. Consider this: Take a PUR bound book, throw it in the washer and watch it disintegrate … except for the spine. No kidding, that's how strong PUR is.
PUR is the ideal solution when perfect binding isn't perfect enough. Try PUR for:
  • Coated text. As anyone who's been burnt before knows, you're taking a chance trying to bind coated text with traditional hot melt perfect binding glues.
  • Books that must look great. Coffee table books, annual reports and other showcase pieces should be bound with PUR glue. Compared to perfect binding, less glue is required. This reduces the likelihood of unsightly glue being forced up the spine, which sometimes creates an unsightly "nail head" appearance.
  • Coatings in the spine. PUR is the only adhesive that can securely bind projects with inks, varnishes, aqueous and other coatings bleeding into the spine.
  • Thick books. Be safe. Heavy, thick books are bound more securely with PUR.
  • Thin books. PUR produces smoother, less wavy spines than traditional perfect binding because the PUR manufacturing process runs at cooler temperatures and draws less moisture out of the paper itself. In general, very thin books – approaching 1/16" – should always be bound with PUR glue.
  • Cross grain text. Use PUR for books with cross grain signatures, for the same reasons as thin books.
  • Frequent use. Reference materials and other books subjected to frequent use should use the one glue that can take it: PUR.
  • Rough use. PUR binding will benefit manuals and other products used in rough workplaces such as automotive and heavy machinery repair shops and the US military.
  • Temperature extremes. Outdoor guide books, maps and other products that will be subjected to extreme environmental conditions should be bound with PUR. Traditional perfect binding glues can cold-crack in sub-zero temperatures, melt on hot dashboards in the southern heat or have pages detach in high humidity.
  • Lies flatter. Cookbooks, instruction manuals and other books that need to lie reasonably flat should be PUR bound. PUR is more flexible than traditional hot melt perfect binding glues and pages do lie flatter with less resistance when opened. Also, PUR won't break when users crease the spine.
A couple of pointers…
Unlike hot-melt adhesives that cure within seconds of application, PUR glue needs at least some time to cure. During this curing period, which might last a few hours, PUR books must remain exposed to natural air because the bonding chemicals in PUR cure by drawing moisture out of the air. Your friends at Seidl's Bindery will never shrink wrap or stretch wrap PUR bound books until they've cured.
Some binderies constantly switch between PUR and adhesive binding. The excessive set-up time can unnecessarily increase project turnaround times. If you want your PUR jobs returned to you faster, look for a bindery that commits the bulk of their adhesive binding equipment to PUR-only production.
About Seidl's Bindery
Located in Houston, Texas, Seidl's Bindery is a leading multi-shift provider of a complete range of post press services including PUR adhesive binding, Wire-O and plastic spiral binding, saddle stitching, cutting and folding, gluing and attaching, die-cutting, film laminating and much more. Seidl's Bindery has two PUR perfect binding lines running at least two shifts. We have the capacity and throughput to attract high volume work from all over the USA.