Response to Query on Curl
Edward D Cohen
In response to your question about curl when ink is applied to film, the curl is the usually towards the coated side of the film. It is caused by residual stresses in the coating applying a force to the substrate, which causes the substrate to bend. The stresses can arise form several causes. Stresses generated, as the coating shrinks during the drying process will cause curl if not relieved. The magnitude of these stresses will depend on the amount of shrinkage, the properties of the binder system, the substrate physical properties transition temperatures and stress relieving in the dryer. Often a high relative humidity et eh end of the dryer and in ambient air. A stronger substrate may also be needed.following diagram shows curl and stresses.
Continue reading "Response to Query on Curl" »
In response to your question about curl when ink is applied to film, the curl is the usually towards the coated side of the film. It is caused by residual stresses in the coating applying a force to the substrate, which causes the substrate to bend. The stresses can arise form several causes. Stresses generated, as the coating shrinks during the drying process will cause curl if not relieved. The magnitude of these stresses will depend on the amount of shrinkage, the properties of the binder system, the substrate physical properties transition temperatures and stress relieving in the dryer. Often a high relative humidity et eh end of the dryer and in ambient air. A stronger substrate may also be needed.following diagram shows curl and stresses.
The following diagram shows curl and stresses
Continue reading "Response to Query on Curl" »
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