In this column, Jim Davis discusses how sample size, particle size, and scale of scrutiny are critical to evaluating whether a powder has a random mix. In some cases, a good random mix might not be statistically achievable with the ingredients and sample size you’ve planned to use. If that’s the case, then you need to adjust to make the mixture statistically achievable. Using examples, Jim explains how to do that.
Mixing expandable polystyrene (polystyrene beads) with additives gives them particular characteristics that are useful in a wide variety of industries. The additives typically used are often needed in very small quantities, yet achieving a homogenous bead and additive mixture is essential. This article describes how a plow-type mixer can be used to achieve the necessary bead and additive blend.
Although there are a variety of factors that affect bulk solids mixing and blending, some problematic issues are common, and one is overmixing. This article explains the risks of overmixing and offers simple tips to help determine and achieve the most optimal mix cycle for your application.
Monitoring mixing processes via inline technology offers practical benefits. This article examines those benefits focusing on the technique of drag force flow measurement. Experimental studies illustrate the capabilities of the process monitoring techniques for a range of mixing and blending applications.
In this column, author James L. Davis revisits a past column in which he explains the mixing test criteria needed to determine if a mixer will do a good job for a specific application. These criteria include how to determine the appropriate mixing time; when, where, and how to sample; sample size; and evaluating the data.
This article aims to provide a better understanding of the operating principles, important features, and limitations of ribbon blenders while also highlighting some basic best practices for efficient ribbon blender operation.
Taking samples to determine when your materials are adequately blended is a vital step in the powder mixing process. In this column, MixTech’s David S. Dickey discusses when, where, and how to take mix samples; types of sampling devices you can use; and sample analysis and the potential costs involved.
Since the early 1950s, pharmaceutical firms have made a substantial financial commitment to research and development of animal nutrients and disease-controlling drugs, both used as feed additives in animal feed premixes. The additives, frequently referred to as microingredients, may number up to 40 in a given formulation. Many are introduced in extremely small quantities- for instance, in milligrams per ton of feed batch- and are measured in parts per million. Because it's critical that these minute quantities of active ingredients be uniformly mixed throughout a batch, formulators of animal feed premixes are confronted with the necessity of maintaining tight tolerances throughout mixing, conveying, and storage
In this column, David S. Dickey explains how a consultant might be a worthwhile investment if you’re having mixing-related problems in your plant.
This article looks at the results of a study that compares magnetically assisted impaction coating (MAIC) with V-blending by comparing powder flow properties after the addition of silica.
Columnist Fernando J. Muzzio explains how to ensure that your blend-sampling regime is effective and appropriate for your application.
Contract manufacturer APCO Packaging wanted to expand production capacity to meet the laundry-detergent-blending needs of one of its largest customers. The operation turned to Eirich Machines, a familiar and trusted equipment supplier.
This glass container manufacturer installed a 50-cubic-foot-capacity rotary glass batch mixer 38 years ago and developed a maintenance program that has kept the unit operating ever since.
The powder blending process can sometimes be a poorly understood processing step in which design errors can lead to potential blending failures.
Dry bulk material batch blending with a pneumatic blender can be accomplished in the conical hopper of a storage vessel or dense-phase pneumatic conveying transporter, rather than in a mechanical blender, saving time, labor, and capital costs.
Particle size and density differences in a powder mixture can make the material subject to disturbing forces or deforming influences, making segregation inevitable. The goal of this article is to provide a better understanding of bulk solid material segregation and how to minimize it.
Columnist Fernando J. Muzzio, along with co-authors Golshid Keyvan, Juan Osorio, and Yifan Wang, discuss small-scale powder blending in which shear rates and normal stresses can affect critical quality attributes of the final product.
Willamette Valley Company was mixing many different powder types, but the operation's ribbon blender was inconsistently mixing a fine-mesh bark powder for use as a plywood adhesive filler, and that was creating a problem.
Columnists Fernando J. Muzzio and Golshid Keyvan explain the effect of blend uniformity on product quality and discuss ways to help you achieve that uniformity.
Columnists Fernando Muzzio and Sarang Oka discuss residence time distribution (RTD) and how you can use it to get a better handle on continuous blending.
A material's characteristics dictate what type of mixer will be most efficient for batch mixing. This article explains what you need to know.
Columnists Fernando Muzzio and Savitha Panikar explain how chemical imaging can help determine the reason a blended product fails to meet homogeneity specifications.
Columnist Fernando J. Muzzio discusses micromixing, a class of mixing phenomena in which the mechanical energy applied during mixing changes the characteristics of individual particles in the blend.
Most tea blends consist of four to six different kinds of tea, and the perfect mix is important. A New Jersey-based tea company installed a new mixer, and now achieving the perfect blend is a piece of cake.