Why PUR adhesive is better than EVA adhesive for book binding?

There are a number of binding options, including Polyurethane Reactive (PUR), Ethylene Vinyl Acetate (EVA) hotmelt and Polyvinyl Acetate (PVA) cold emulsion adhesives, or Smythe sewing. PUR has only been in bookbinding since about 1989. PUR binding was first adapted by midsize trade binderies for producing many trade journals and annual reports due to short lead times using highly coated and cross-grained papers without sewing. These markets will continue to be the high users of PUR, but publishers are now recognising the benefits of PUR and are requesting the use of PUR binding to ensure quality and longevity to their products.

Why PUR?

Since its introduction, PUR use has increased dramatically. PUR is chosen over standard hotmelt adhesives for many reasons, the most important of which are its superior adhesion and the ability of a PUR-bound book to lie flat when open.

It is very important to understand the main differences of the two important binding technologies in the market today.

Different types of Glue


Advantages of PUR

1) Excellent flexibility and lay-flat quality.

2) Cold and heat resistance enabling books to be bound, stored and used in extremes of temperature.

3) PUR can bind varnished, UV-coated, carton, mylar and other stocks.

4) Impervious to print oils used in the digital print process and binding quality is unaffected by ink migration into the spine.

5) 40% to 60% better page pull results as compared to EVA Hotmelt.

6) Can handle recycled papers.

7) Handles cross-grained stocks better.

8) Square backbone: Because only a small amount of PUR needs to be used for binding, less adhesive is squeezed out when the cover station and side clinchers attach the cover and form the back.

9) PUR is also environmentally friendly due to its low VOC (Volatile Organic Compounds) and the working temperature is set at around 120°C while EVA is at around 170°C.

Advantages of EVA

1) Fast curing (in few seconds) & Quick turn-around time.

2) It is cheaper when compared to PUR glue.

3) Ease of operation, most often it is very easy to handle and maintain PUR gluing system as compared to Hotmelt gluing system.

4) Finished book can be easily handled.

5) Cleaning process of EVA binders is very simple/easy as compared to PUR binders. Most often it takes more time to clean PUR binders.

4) EVA Hotmelt glue still have their place in book-binding, especially when it comes to binding thread-sewn books, as the thicker glue allows for greater penetration into the spine area of the folded sections.


In summary, both processes are still widely used within print finishing. The question’ which is best’, probably needs to be replaced with the question ‘which is most suitable’, as the decision to use one over the other is very much job specific and would involve numerous considerations – from substrate used and thickness of the book, to the intended use of the product and any financial constraints to produce.

Amey Alshi

International Commercial Marketing

Duplo International’s Success Story

I’m now approaching my 24th anniversary with Duplo International Ltd, having joined the business in June 1988. I’m rather proud to have been part of the team that has helped grow the business nearly ten-fold in that time.

The success of the business is due to the marriage of cutting edge product innovation & manufacturing, combined with first class sales & distribution. Duplo Corporation in Japan maintains a high level of innovation, producing products that meet the changing demands of our customers, those organisations producing printed products for their customers. Innovation is based on their possession of long and established work in this specialised field. Duplo have been tremendously successful in developing products that meet the needs of the ever changing digital print market. http://www.duplonet.co.jp/eng/welcome/

Over the past 25 years, Duplo International Ltd has developed an extensive distribution network, starting from its base in the UK, and then developing via distributors across the old European Common Market during the 1980’s, followed in the 1990’s by developing new relationships with the Eastern European countries after the fall of the Berlin Wall and exploring opportunities arising in Africa & the Middle East. We now have a network of distributors stretching across 70 countries. Looking back, the world seems a much smaller place than it was in the 1980’s!

People are a big part of our success and we have always been careful to recruit talented multi-lingual people from across all our territories. This ensures we have the best understanding of local markets and the needs of our customers. By investing in people with a broad range of talents in sales, marketing & engineering, we ensure the best possible support for our products and customers.

Financial stability & strength are an important element in a successful business. By re-investing in the business we have ensured we have the financial stability to carry stocks of product, available for immediate delivery to the network of distributors across our region. Financial stability also enables us to keep pushing into new markets, both in geographical terms and in the range of products we stock & distribute.

For any business, it is important to keep exploring the opportunities for growth. I believe we provide our customers with this same opportunity by supplying them with innovative products, allowing them to provide new services to their client base. Allied to our after sales service, investment in a Duplo machine is an investment for the future growth of a business.

Many years ago there was popular business adage ‘no one ever got fired for buying IBM’ such was the reputation of IBM for quality, innovation and support. Even today, in these difficult economic times, IBM continues to outperform the rest of the IT sector due.
Duplo aspires to the same reputation in the print industry. In troubled economic times, investing in a Duplo product is a great way for our customers to gain a competitive advantage.

Glyn Nutting
Financial Director


Am I a Twit?

This was my conundrum – am I being a Twit to enter the world of twitter, or am I a Twit to avoid the whole area of social media?

Would it be another drain on my time, as I grapple with all the new contacts and scratch my head to create catchy messages, or will it open up a whole new valuable resource?

Being somewhat old school, I was also concerned about security – could someone steal my identity and what about legal issues? Would I fall foul of the law inadvertently?

In the end I decided if it was good enough for the BBC and far more eminent people to use, it must be something to at least try for myself.

A colleague showed me how to find the Twitter site and l logged in my details. Next I had to find five other Twitter accounts to start me off. It was as easy as that. Now I have to start the creative part and this article is my first step to try and help others who might have felt as I did. So if you would like to share your thoughts and business experiences with me we can set forth and begin our journey together.

From a new Twitter recruit.

Kind regards,

Nina Laverock

Marketing Communications Manager


A warm welcome to Duplo International’s blog.

We, as a major supplier of print finishing equipment, keep on reminding the users of the equipment we supply that in order to survive in the current economic climate they have to become communications service providers rather than just print providers and that requires, among other things, a new, modern approach to communication with their customers. Now, it seems, we do what we have been preaching and adopt the latest methods as well as technology to reach out and tell our story.

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