"Traditional PURs develop initial bond strength through a lowering of temperature in the same way as hotmelt. There is no chemical cure so they're left somewhat weak until they cure," said a Henkel spokesman.
The glue's chemical make-up allows Dual Cure to begin bonding immediately after exposure to the correct UV wavelength.
The process means it reaches 80% strength in minutes, so that the book can be handled and finished immediately at speeds of up to 10,000bph. Opening up PUR to areas where only dispersion and EVA hotmelt glues could traditionally be used.
According to the firm, the cost of converting to running Dual Cure, around 20,000 (30,000), and the consumables costs are comparible to that of conventional PUR systems.
Story by Darryl Danielli
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