Making relevant scientific advancements in coating technology

Rely on Coating Tech Slot Dies.

MANUFACTURING — Slot dies and products that WORK for your process
CONSULTING — Experienced staff solves your on-site issues
TECHNICAL TRAINING — Makes operators and engineers even more efficient and knowledgeable

What sets Coating Tech Slot Dies apart?

When comparing vendors, it is important to take the 3P approach and review process knowledge, precision manufacturing, and product performance:

Process Knowledge

With years of industry experience working in internationally known firms, the principals of Coating Tech Slot Dies understand your coating process and the results you need to provide. We apply our extensive process knowledge to your unique situation and promptly provide the most effective and efficient solutions for you.

Precision Manufacturing

Every customized slot die is manufactured with the finest materials to a precise tolerance. Our facility has full on-site manufacturing capabilities with machine tool research and development, wet lab, and analytical tool divisions.

Product Performance

Attain consistently superior results and performance. The service you receive after the sale will guarantee your coating system maintains peak performance for maximum return on investment. As specialists in the science of slot dies, we are on the leading edge of new product development and uniquely positioned to ensure your coating system continues to serve you as your industry advances with new technologies and materials.

The Science of Slot Dies

Coating Tech Slot Dies designs and manufactures slot dies for clients in coating industries. In addition, the firm also has a service unit which provides process consulting, parts and service, and organized technical training to repair and improve your coating operations.

We can help you determine what equipment is best for your process, and suggest design and construction options to provide the precision you need with maximum durability and equipment life. We mind the details down to finishes, properly sized bolts and washers, tools, and cases, to ensure your precision product works for you.

All of Coating Tech Slot Dies products are designed and manufactured in the USA.

Making relevant advances for your coating process is what we’re all about

Our Industry Experience

Requesting a Product Quote or Equipment Proposal

So you’ve decided to purchase some coating equipment and you are not sure where to start. Don’t feel overwhelmed with the information required, it really boils down to a few key concepts:


Rheology is the study of flow. In our case, we are concerned with what happens to the viscosity of the fluid as shear is applied. This knowledge can be developed by doing capillary or parallel plate rheometry. Shear based testing does need to be run and the information has to cover 1-10,000 1/sec. If shear based data is not provided, the slot die design work cannot commence. With an understanding of the coating process, system influence, rheological basis and technique of coating based off the final product construction, Coating Tech Slot Dies has all they will need to design and manufacture your precision coating station.


Typically you understand the product that you are trying to create, but not much thought goes into the process of manufacturing the product. So we have to start with the end and work our way back. What coating thickness does your product need to be? Discounting the thickness of the substrate, how much dried fluid should be left on the web? People usually know this final coated and cured thickness, and if we know the percent solids we can calculate the wet coated thickness. Both are not necessary, but at least one and the percent solids is. Some products require a set width of coated product for the final converted and saleable roll of material. From here, you can coat multiples of this width. As an example, if a final roll of adhesive on the shelf sells at 10 inch (254 mm) wide, then the coat width could be 10, 20, 30, etc. inches wide to be cut down to the final product for sale.


There are five main components required to develop precision coating:

  • Slot die. To properly design the slot die all the variables listed are required, but the fluid rheology and coat weight are paramount.
  • Positioner. The equipment that places the slot die requires information about the wet coating thickness. This determines the gap that the slot die and substrate should have for proper coating.
  • Backing roll. The backing roll is subject to line speed and operating temperature concerns because the temperature of the fluid may need to be maintained outside the coating head.
  • Fluid delivery system. To decide between various positive displacement pumps, knowing whether the fluid is shear sensitive, has particles and requires temperature all play a role. In addition, compatibility with solvents can determine materials of construction. Density and viscosity of the fluid are critical for both the pump and the slot die design.
  • Substrate. Understanding both the thickness of the substrate and the roughness of the morphology help the equipment designer understand what technique would be required.

The coating technique is based off thickness of coating, temperature of application and roughness of the substrate. Coating below 1 mil (25.4 microns) may lead the equipment supplier to provide a vacuum assist coating system or tensioned web over slot die arrangement. Coating thin at high line speeds may lead to curtain coating. Operating at temperatures above 300°F (149°C) may point to a flexible lip slot die over a fixed lip slot die. It is also good to know if the coating will always be full width or coated with dry areas in-between lanes of coating. Do you require dray areas down web in addition? And ultimately how many coated layers form the functional product?

With an understanding of the coating process, system influence, rheological basis and technique of coating based off the final construction, Coating Tech Slot Dies has all they will need todesign and manufacture your precision coating line.

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