One of the key issues challenging the book printing industry in India is the necessity to thread-sew book blocks before cover pasting. For example: thick books, diaries, book-blocks for hardcover binding. However this leads to inordinate delays in delivering the book to the market.  At the moment, thread sewing is the only bottle-neck in bookbinding. Welbound realised that Polyurethane Reactive (PUR) hotmelts is the only solution for such jobs.

WB3600-PUR at Printpack

India's first high speed PUR perfect binder launched at PrintPack India 201

PUR, as we know, needs controlled environment, machines, applicators and know-how. For this, they tied up with the world leaders in this technology - Henkel Adhesives and Robatech AG.  At Printpack 2011, Pragti Maidan, New Delhi India's first high speed PUR Perfect Binder WB 3600 was demonstrated - producing annual diaries. The product- annual diaries are a challenge when it comes to testing the binding durability. That is the reason, book-blocks are produced through a complex process involving thread sewing, reinforcing and the list goes on. Hence this was made as a test case for PUR perfect binding, eliminating sewing.

PUR has been chosen over standard hot melt adhesives for many reasons—with superior adhesion and lay-flat, being the most important ones. There are other benefits too:

high heat and cold resistance, less wrinkle on backbone, solvent resistance to name a few. In comparison to thread sewing a job first and then pasting a cover - PUR takes much less turn around time, at lower costs.

Welbound offers 2 solutions for PUR perfect binding. (1) A single clamp binder with a Robapress pre-melt tank that can hold and dispense PUR into an open pot and (2) the WB3600 with nozzle applicator and Robatech MOD 4 dispensing system.

According to K C Sanjeev, the managing director of Welbound Worldwide "The response at Printpack was unprecedented. We have not seen such a huge interest in any technology in post press, so far in India. The educational publishers are pleased that they can have

ready to market books, in much shorted turn around time. The commercial printers are happy that they can print their brochures and books with ink or coatings spread on to the spine. Coffee table books can now be produced completely lay flat". At the exhibition, the orders for the single clamp were more than the expectations.

Welbound intends to work closely with publishers and printers in order to make them adapt the new technology, easily.This would involve placing the PUR machines at strategic locations for trials. "We would run actual jobs and guarantee the durability of binding. Only live trials can give the confidence to the publishers and printers" Says Suresh Nair, the Regional Manager of Welbound North, who also will be responsible for training on the PUR application technology. 

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