Comparison of PUR binding and EVA binding

Posted by apaksystem on January 13th, 2021

PUR binding is a type of perfect binding that has gained quite a popularity in the last couple of years. However, it’s important to not confuse PUR binding with the traditional perfect because different types of adhesive are used during these processes. Traditional perfect involves the use of EVA (ethylene vinyl acetate) adhesives, while PUR (polyurethane reactive) adhesive is used in case of PUR binding. The properties of PUR adhesives make them a better choice compared to EVA adhesives. Here’s explaining all the things that make PUR binding a better option than EVA binding.

Why choose PUR binding over EVA binding?

One of the main reasons to opt for PUR is that it considerably increases binding strength. After the adhesive is set, page pull testing shows that PUR binding is fifty percent stronger than EVA binding. Moreover, it comes with increased aging stability, remains impervious to print oil migration, and has the ability to bond with cross-grained and coated stock. And, the best part is the high durability of PUR adhesives. It is really helpful that it is the kind of material that isn’t susceptible to the issues of extreme temperature, which is not something that can be said about EVA binding.

Unlike the traditional process, PUR has reactive components that cure in humid conditions and form a sturdy elastomeric film. Also, PUR is not melted when exposed to heat and remains insoluble to most of the solvents. On the other hand, EVA binding melts on exposure to extreme heat.

The flexibility factor of PUR binding

It is true that it becomes really hard to pull the pages from a book that has gone through PUR binding. You cannot reactivate the adhesive, which makes it a durable option. But, when you think of all these facts, it naturally gives you the impression that PUR binding lacks flexibility. However, flexibility is one of the main benefits of PUR binding. Case in point, PUR scores well (more than a thousand flexes) in flex tests.

PUR binding involves using a thinner application of the adhesive than EVA. The thinner application, along with the reactive properties, makes PUR highly flexible. Furthermore, the thin application of adhesive improves the performance of the binding, and gives it more mileage over the course of time. The use of less adhesive on the binding’s spine ensures that the shape remains intact and the overall appearance is cleaner.

Apak Systems, Inc. has a PUR machine for perfect binding in Vancouver to offer you high-quality services every time. Keeping up with the company’s reputation to never compromise with quality, they have embraced the superior PUR adhesive to offer you strong and durable binding.

William Nathan is the author of this Article: To know more about Perfect Binding please visit the website.