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CannabisProcessing

CANNABIS PRODUCTS | NOVEMBER 2020

Using High-Shear Mixing to Develop Cannabis Edibles

High-shear mixing is critical for developing stable emulsions, homogenous cannabis-infused products.

By Alyse Thompson-Richards, Editor in Chief
Ross Ribbon Blender

courtesy of Charles Ross & Son Company

November 9, 2020

Developing successful mixing processes for cannabis-infused food and beverage manufacturing relies on several factors. Moreover, manufacturers of mixing equipment note one process in particular is especially important to consider: shear.

Identifying the correct level of shear, or the level of aggressive action required to properly combine ingredients, is critical for achieving homogenization, solubilization, emulsification, powder wet-out, and deagglomeration, says Christine Banaszek, sales manager, Charles Ross & Son Company, Hauppauge, NY.

For the latest insights on developing cannabis-infused food and beverages, visit cannabisproductsmagazine.com

Shear levels vary between formulas and applications, adds Banaszek. Some will require high-shear mixing, while for others, low-shear mixing will suffice.

“Fine dispersions and emulsions typically require high shear to achieve the desired stability, texture, color, density, uniformity, potency, and other metrics,” says Banszek. “On the other hand, not all products require intense shear—mixing too aggressively could overheat or irreversibly damage certain formulations. For this reason, it is necessary to select the mixing action that is appropriate for the viscosity range and shear level requirements of a particular application.”

mixer
courtesy of Silverson Machines Inc

Benefits of high-shear mixing

To create homogenous cannabis food and beverage products—and stable cannabis emulsions with small droplet sizes—high-shear mixers are often the way to go, notes Brian Martin, technical sales manager, Silverson Machines Inc., East Longmeadow, MA. “Achieving a small droplet size is difficult with conventional mixing equipment, such as stirrers, blenders, etc.,” he says. “Utilizing a high-shear mixer resolves many of the challenges faced with using these less-effective mixing methods.”

mixer
courtesy of Admix

Martin notes using equipment without enough shear, particularly when trying to create an emulsion with “highly viscous” cannabidiol (CBD) oil into a lower viscosity liquid, could lead to simply pushing the oil around the tank, not fully incorporating it into the mixture.

“Even after a long period of mixing, there may be some undiluted CBD oil remaining,” says Martin. “This could lead to lack of clarity, raw material loss, etc. A high-shear mixer with tight tolerances will ensure that all of the material is reduced in particle size and uniform.”

Proper mixing is also critical when it comes for cannabinoid potency testing. If the product developer has not properly mixed the solution, and it is not uniform, there may be variations across the product. Regulations prohibit selling products with potencies that do not adequately match labeling, and recouping or reworking cannabis ingredients may not be possible.

“As the industry moves forward, at some point it is expected there will be more stringent regulation, and this will become even more critical, as variations in potency will be unacceptable,” Martin says.

Another benefit is speed, says Ruston Sullivan, western regional sales manager, Admix, Inc., Londonderry, NH. Not only do high-shear mixers create finer emulsions faster, they also reduce batch times, allowing for multiple batches within a production period.

“There are a lot of manufacturers looking to get things done faster, and that’s where high-shear comes into play,” says Sullivan.

mixer
courtesy of Charles Ross & Son Company

Additional factors

Apart from shear, manufacturers should also identify product viscosity and density, operating temperature, and desired capacity, Banaszek says. She also cited the method and order of ingredient additions and whether the product’s process dictates multiple mixing stages as important considerations.

Scalability is another major concern. For burgeoning cannabis food and beverage companies, starting small with lab or pilot-sized equipment and then moving to larger machines can help manage capacity as they grow.

“Making sure you start off with a piece of equipment that can scale up adequately will save a great deal of trouble in the future,” says Martin.

Some equipment manufacturers offer trial programs, where cannabis-infused food and beverage manufacturers can test equipment at their own factories or at supplier innovation centers before committing to a purchase.

“It allows manufacturers to determine realistic batch times and identify any potential bottlenecks relating to mixing, temperature control, product transfer, cleaning, etc.,” says Banaszek.

mixer
courtesy of Charles Ross & Son Company

Mixers on the market

Martin says Silverson’s L5MA lab-scale mixer has been popular because it allows customers to try different features, speeds, and work head options. Initially working in small batches helps customers save on cost and raw materials.

mixer
courtesy of Admix

However, as demand and production needs grow, manufacturers may turn to inline mixers, which can process larger batch sizes. Martin notes cannabis food and beverage processors can use inline mixers as a discharge pump, saving the cost of an auxiliary pump. He adds Silverson offers a dual-stage inline mixer, which helps produce a tighter particle distribution for fine emulsions.

Banaszek says Ross Laboratory High Shear Mixers are desirable for their versatility and cost-efficiency. “These plug-and-play mixers allow end users to prepare superior emulsions in standard beakers and containers up to 4 gallons at a time,” she says. “They are very well suited for development work and small or pilot-scale production of low-viscosity emulsions and dispersions.”

Ross also offers Dual-Shaft Mixers for thicker applications that require heating or cooling and deaeration during the batching process. These include an anchor agitator with scrapers that continually exchange materials from the vessel’s surfaces toward the center of the batch.

Ross Ribbon Blenders work for dry applications such as powdered supplements, tablet or capsule preparations, baking mixes, beverage powders, sweeteners, coffee, or tea. A Ribbon Blender equipped with a spray bar enables uniform addition of minor liquid components into bulk solids.

Admix also offers a variety of options for in-tank and inline mixing. The company’s high-shear, in-tank Rotosolver mixer features a single shaft and a one-piece, clean-in-place mixing head. Made with stainless steel, it’s available in a variety of production sizes.

Sullivan notes Admix’s BenchMix benchtop mixer includes the Rotosolver head. It can mix 1–19 liters at up to 12,000 revolutions per minute. The company also offers the Rotostat high-shear in-tank emulsifier, which provides lump-free emulsification of oil and water, starches, gums, syrups, and other high-viscosity solutions.

For continuous-processing operations, Admix has developed the DynaShear Inline Mixer. Constructed completely of 316 stainless steel, its dual-stage axial and radial heads provide optimal throughput and flow. In addition, the shear rates generated ensure droplet and particle size reduction down to 3–5 microns.

Admix introduced a pilot version of the DynaShear mixer, the DynaShear 215, last year. This lab model mounts to a mobile cart and includes a variable frequency drive (VFD) for accurate scale-up.

Sullivan says it is critical for equipment suppliers to develop strong relationships with their manufacturing customers in order to support them through all phases of business growth. “We don’t want to sell them one piece of equipment, hope it works for them, and call it a day,” he says. “Our hope is to provide them a solution throughout their whole production process.”

 

This article was originally posted on www.preparedfoods.com.
KEYWORDS: emulsification equipment mixing

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Alyse thompson richards
Alyse Thompson-Richards has held many positions with BNP Media, first serving as an intern at Candy Industry in summer 2012. She joined Candy Industry's staff full time as associate editor in August 2016 after a few years at newspapers in West-Central Illinois. Alyse has since served on Cannabis Products Insider and joined FOOD ENGINEERING in 2024. She has bachelor’s degrees in journalism and Spanish from Western Illinois University. Image courtesy of Thompson-Richards

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