Read this article to learn the three best practices we recommend implementing to achieve optimal adhesion levels in extruded structures.
When trying to manufacture structures with multiple layers, a chemical primer is usually needed to improve bonds between a substrate and a coating, such as an extrudate, or ink. Primers can also help to enhance barrier properties, aesthetics, and overall performance of the finished structure. Water-based primers are a common choice because they provide superior performance on a vast array of substrates and are generally a safer and more sustainable choice compared to solvent-based primers. However, not all water-based primers are created equally. There are several factors to consider when choosing the appropriate primer for your application. This document can help.
If higher bonds, better adhesion to substrates or improved water resistance is desired, Mica’s urethane products can be crosslinked with a water-based curative, such as CX-100 (1). This Primer Intelligence article will explain how to successfully prepare, mix, and add CX-100 to Mica’s urethane primers.
It is imperative to maintain adequate pH levels when using Mica’s Ethylene Acrylic Acid (EAA) primers. If the pH drops, foaming or other issues may occur which could slow down production, or worse, ruin the primer. This document is meant to assist you with maintaining the pH levels in our EAA products, and to give suggestions on how to fix the primer solution if the pH levels decrease.
Use this Primer Intelligence article as a guide for choosing and using the correct plumbing system and materials that will work in concert with the chemistry of the primer to help prevent quality issues and other contaminations that may cause adhesion issues or delays in production.
This Primer Intelligence contains information about how to prevent primer discoloration.
This is a quick guide on how to properly dispense Mica product from IBC totes.
Click above to find out which container option is ideal for your application needs.
Water-based MICA primers are formulated to adhere to polymeric films, paper, and foil. However, many of the primers are also prone to bonding with chrome and ceramic applicator cylinders, metal machine parts and other equipment when dried. The recommendations in this document are the culmination of more than 40 years of priming and clean up experience.
Don't over-apply. Don't under-
Many flexible plastics converters extrude low-density polyethylene ("LDPE") on a daily basis. This resin is easy to process and meets the customers' requirements for adhesion, cohesion, and chemical resistance.
Mica extrusion coating primers have been developed for single-pass processes. The best performance will always be achieved when the primer is applied immediately prior to extrusion coating.
Sometimes, however, there is a need to perform a multiple-pass process, where a substrate is primed, dried, rewound and stored for later use.
Do we have to prime if we treat? Do we have to treat if we prime? The answer is YES to both
The function of a chemical primer is to enhance adhesion and contribute product resistance to a converted structure.
In our last issue of Primer Intelligence, we described the heroic effects of flame and corona discharge treatment. Now it is time to back-peddle a little and warn of the risks inherent in too much of a good thing.
Primer application is not limited to gravure systems. Many converters have found smooth roll applicators well suited to apply MICA
Adequate oxidation of an extrusion coating resin in the air gap is critical for adhesion to the primer.