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Question
#921
Subject: Does the depth of holographic impression depend upon the hardness of the rubber roller during embossing?
Does the depth of holographic impression depend upon the hardness of the rubber roller during embossing?
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#922
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Subject: The impression will depend on the temperature of the film, the pressure in the nip and the foot print of the impression (dwell time)
The impression will depend on the temperature of the film, the pressure in the nip and the foot print of the impression (dwell time)
The foot print size will depend on the hardness of the nip roll as well as the nip pressure. If the nip pressure is raised it is possible that the nip roll will bend increasing the pressure at the ends of the roll and decreasing in the center so it is a balance between the several process parameters. The roll hardness will also impact on the force transmitted to the film to induce the flow into the impression roll as the hardness will control the level of force in the nip due to the deformation of the roll cover. Also the thickness of the cover will impact some.
You can try a lower line speed to see if the dwell time is controlling or increase the impression roll temperature. Increase nip pressure to see if this improves or is limited by the nip roll hardness.
You should take a nip impression at various pressures to determine if the nip impression is uniform and that there is no nip deflection.
Best would be a designed experiment using roll temperature, nip pressure and line speed as variables to see which is controlling for the film you are using
Eldridge M. Mount III
585-223-3996
www.emmount-technologies.com
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