Nip Roll Design and Bonding Pressure
topic
Lamination nip rolls apply controlled pressure of 0.5 to 5 Newtons per millimetre width through pneumatically or hydraulically loaded rubber-covered rolls pressing the two substrates together immediately after adhesive application, with nip pressure and temperature controlling adhesive wetting of the second substrate and the intimate contact required for full bond strength development before the adhesive sets or crosslinks after the nip.
Role
Governs the adhesive wetting contact and bond area that determines ultimate peel strength of the laminate through the combination of nip pressure and temperature that forces the adhesive to wet the second substrate surface, with inadequate nip pressure causing incomplete bond formation and void areas that reduce peel strength and create the potential for delamination during use, while excessive nip pressure compresses sensitive membrane or foam substrates causing irreversible structure damage.