The last post described using a single shaft mixer with a cowles blade (as shown above). The single shaft method is good for simple dispersions where in-situ vacuum degassing is not critical. However, if vacuum degassing is required, multi shaft mixers provide an efficient means to disperse fillers under vacuum. Dual-shaft mixers are used to produce a wide range of viscous ... [Click to Continue...]
Dispersion of Highly Filled Thermosets – Part Two: Single Shaft Dispersers
This post will cover the simple case where high shear is required without vacuum degassing. The mixer consists of a single shaft with a Cowles dispersing blade mounted on the end. The image below is from Mixer Direct (Mixer Direct high speed disperser ) In the image above, the mixing vessel is not shown in order to visualize how the dispersing blade would be ... [Click to Continue...]
Dispersion of Highly Filled Thermosets: Part One – Introduction
A previous post touched briefly on dispersion techniques used to incorporate fillers into un-cured thermoset resins. This post is the first in a series covering dispersion techniques. Many commercially available thermoset-based products rely on fillers to provide significant property enhancements. Fumed silica was shown to be a very effective rheology modifier when a yield ... [Click to Continue...]
Happy Holidays and Best Wishes for a Prosperous New Year
To all my loyal readers, thank you for you interest in my blog. To all, have a safe and relaxing holiday season. Take some time to be with family and friends and enjoy some time off. I will be on vacation until Jan 2, 2019, so my next post will be on Monday January 7, 2019 (whew, where did 2018 go?). After the holidays, we will dive back into mixing and dispersion methods ... [Click to Continue...]
Polymers in Electronic Packaging: New Advances in Build-up Technology
Build-up film technology has been an integral part of high-density interconnect (HDI) circuit boards for decades. As shown in the figure above, the build-up layers are used to fabricate fine lines and stacked vias in high density circuit boards. One supplier is Ajinomoto Fine-Techno and the products they introduced have been termed “ABF” for Ajinomoto Build-Up Films. Sekisui ... [Click to Continue...]