Coating & Laminating
Slot die coating: Thin and accurate
n the world of slot die coating, thin is in. Or, to be more precise, thin and accurate is in. According to Scott Zwierlein, Frontier: “Roll-to-roll slot die coating has become the industry standard for extremely thin and extremely accurate coating.” Within the fields of electronics, medicine and
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pharmacy converters are challenged by tolerances required. The needs of these fields exceed the capabilities of traditional extrusion dies. However, slot die coating can meet the new thickness and accuracy requirements necessary. With a slot die, Zwierlein says, an attainable wet coating thickness of less than two micron can be achieved.
THE ATTRIBUTES OF SLOT DIE COATING A number of attributes need to be present to
help slot die coating deliver its capabilities, if present, the result will be significantly beneficial compared to traditional methods, in terms of functionality and cost savings. These attributes include: Precision pre-metered fluid delivery; extremely flat and straight die surfaces; high- precision backing roll; accurate and precise positioning of die to the substrate; and a contamination-free environment.
INDUSTRIES FOR SLOT DIE COATING Slot die is becoming increasingly necessary in a number of industries. Here are a few applications: Micro-electronics: Flat panel displays, thin circuits. Batteries and capacitors: Lithium-ion battery electrodes, multilayer ceramic capacitors.
Barrier films: In food and medical packages, liquid film coatings are being applied to food coating. Solar photovoltaic: Solar cells require thin coatings. Medical diagnostics: Chemistries and other solutions need to be accurately applied. Variations in thickness can result in variations in results. Transdermal and oral pharmaceuticals: The more accurate the transdermal is coated, the more accurate the dosage.
AN ADVANTAGE FOR INDUSTRIES Converters looking to meet tighter tolerances are finding that traditional extrusion dies cannot keep up with new systems. Businesses in such a competitive industry can use slot die coating to remain competitive and profitable. To access the full article on this subject, visit Delta ModTech’s blog:
www.deltamodtech.com/blog/slot-die/.
www.frontiercoating.com
www.convertermag.co.uk
November 2017
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