In der Klebebindung entscheidet der richtige Klebstoff über Qualität, Haltbarkeit und Verarbeitung.
The two most important systems are EVA (hotmelt) and PUR adhesive.
But what are the differences – and which one is the right choice for your production?
What is EVA Glue (Hotmelt)?
EVA is the traditional hotmelt adhesive used in print finishing.
The glue is heated, applied to the spine, and hardens as it cools down.
It is a well-established standard, especially in offset printing.
Key characteristics of EVA:
EVA is easy to handle and cost-effective.
The adhesive remains in the machine and can be continuously refilled.
In most cases, there is no need to dispose of it at the end of the day.
EVA works best with uncoated papers and standard production jobs.
What is PUR Adhesive?
PUR (polyurethane) is a reactive adhesive that cures through a chemical reaction with moisture in the air.
Unlike EVA, it does not simply harden by cooling, but by reacting chemically – which results in a much stronger bond.
Key characteristics of PUR:
PUR offers very high bonding strength and creates durable, flexible bindings.
It is especially suitable for coated, laminated, or glossy papers.
Special Considerations When Using PUR
In daily production, PUR requires a different approach than EVA.
Since PUR reacts with air, it cannot simply remain in the system.
Any remaining adhesive must be disposed of or the system must be properly sealed.
Components that come into contact with PUR are specially coated to prevent adhesion.
As a result, cleaning and maintenance requirements are higher compared to EVA.
The Key Differences
EVA is the simpler solution for everyday use.
It stays in the machine, is easy to refill, and requires minimal maintenance.
PUR, on the other hand, requires more attention.
It reacts with air, cannot be reused, and demands careful handling and cleaning.
However, PUR delivers significantly stronger bonding and performs reliably even with difficult materials.
When Should You Use EVA or PUR?
EVA is ideal for standard production, especially in offset printing and with uncoated papers.
If ease of use and cost-efficiency are priorities, EVA is the right choice.
PUR is the better option for more demanding applications.
It is the preferred solution for coated, laminated, or digitally printed materials where strong and durable binding is essential.
Conclusion: The Adhesive Makes the Difference
Both EVA and PUR have their place in perfect binding.
EVA stands for simplicity, reliability, and efficiency.
PUR delivers maximum performance and bonding strength – even under challenging conditions.
In practice, many binding issues are not caused by the machine itself,
but by choosing or handling the wrong adhesive.
Practical Tip
When working with PUR, proper cleaning and correct handling are essential.
With EVA, consistent temperature and stable processing are the key factors.
