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Question
#141
Subject: What methods are used to coat gels?
What is the common process by which gels are applied to films (OPP, foils, etc.) with commercial coating equipment (such as application of the ultracapacitor electrode layer)?
Answers (links jump to full text of answer below)
#156
Author: Larry Gogolin, Gogolin & Associates
Email: LGOGOLIN@aol.com
Subject: More information is needed, but in short...
To more fully answer you question I would need to know a lot more about your
fluid (solids, viscosity, rheology, type of gel) and the thickness and
quality requirements of the final coating. However, a direct answer is that
hydro-gel, such as used on medical instrument conductive pads typically use
knife over roll. Photographic gels are coated with slot die or slot slide
(more accurate). Battery separator layers are often done with knife or slot
die.
If I can be of any further assistance, please contact me.
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#157
Author: Jim Wheeler, Weseeco
Email: jwheeler@weseeco.com
Subject: There are several coating metthods...
There are several coating methods to consider (e.g., gravure, roll coating,
slot die, curtain coating) and the choice depends upon factors suchs as:
type of solvent, nominal thickenss, thickenss uniformity, production rate
required, width of support, rheology of the fluid, number of layers
required, number of passes allowed (for multiple layers), tmperature
sensitivity of coated material, etc. Selection of a coating process
requires a good understanding of technical as well as business requirements.
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