Candy Manufacturers Add Health, Sustainability to Production Operations

Buoyed by a wave of steady growth, North American confectioners are lowering operating costs and climbing aboard the healthy-eating bandwagon.

By Kevin T. Higgins, Managing Editor

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Half of the 600,710-sq.-ft. building is held at 65° F with low humidity and dust-free air to maintain product quality during storage, a particularly important consideration for a seasonal product like Peeps. Surplus space allows Just Born to address logistics issues: Other candy companies warehouse product there for a cross-docking operation. "Transportation is a big cost for a lot of companies, particularly if you're shipping LTL [less than a truckload]," says Pye. "We're going to the same customers" as the warehouse's other tenants, making the co-loading arrangement mutually beneficial.

In the mid 2000s, management recruited a Six Sigma black belt to kick-start a continuous improvement focus. "Six Sigma is a tool of lean, and lean has evolved to become a broader approach to eliminating the seven forms of waste," notes Ron Nelson, Just Born's director of manufacturing, himself a green belt. The initiative has grown to include a number of formalized programs, including visual factory, 5S (Sort, Shine, Set in place, Standardize, Sustain) and SMED, short for single minute exchange of dye. Variety is central to candy production, and driving down changeover time is a continuous-improvement priority.

Training floor leaders in skills such as value-stream mapping and how to execute change is part of the shift, but a central focus is changing people's mindsets. A recovery system that returns excess sugar on conveyor belts for rework was a start, "and how you keep from generating the waste to begin with" then becomes the focus, says Nelson.

Art vs. Science

Change comes slowly in process industries, and understandably so. Why abandon the certainty of what's working for the risk of promised improvement? Gregory Ziegler, a professor of food science at Pennsylvania State University who has demonstrated the efficacy of high-shear mixing as an option to accelerate the conche process for chocolate, notes that traditional methods continue to prevail.

"A lot of people believe in the art of conching, that there are magical things that occur during conching," Ziegler observes. Instead, the effects of a 10-plus hour conch can be accomplished in minutes with high shear mixers, but manufacturers are loathe to divest themselves of the large tanks and equipment needed for the traditional conche. "Understanding chocolate as a composite material is not as romantic," he allows, although "a lot of experimentation is going on in small companies."

On the other hand, the convergence of the health benefits of dark chocolate and the growing popularity of high-end foods, be they craft beer or gourmet chocolate, "has invigorated the industry," he continues. Single-unit machines that mill and conch like Netzsch's ChocoEasy, coupled with the application of material-science discoveries, are ushering in product innovations and better control of product structure.

For example, small variations in moisture content have a big impact on material deformation and flow, particularly with milk chocolate, which requires very tight moisture tolerance. Variable moisture levels in spray-dried milk powder can upset transformation in the fat phase. "If you pre-dry the milk powder, you can control the moisture better," Ziegler says, and manufacturers are adding that quality-assurance step to their process.

A former student's thesis demonstrated that predrying could accelerate the process and result in better rheology, though the impact on flavor "remains a mystery," he adds. The same could be said of many confection-process tweaks, which often rely on trial and error.

Such is the case with pump selection. "Confection is not an ideal product to pump," points out Dave Caldwell, product manager-lobe and centrifugal pumps at Xylem Inc., White Plains, N.Y. "The sugar crystallizes. Chocolate is extremely dirty and tends to crystallize on the seal faces." Gentle pumping with no shear might dictate selection of a flexible impeller pump in some applications, but that still leaves the issue of seal selection. "How the line is set up dictates what will work, and every line is different," he says. "Nothing is set in stone."

To illustrate, Caldwell cites a project with a maker of gummy bears. Regardless of the pump used, seal failures persisted. Crystallization caused mechanical seals to crack, and O-rings couldn't tolerate the pressure. Sanitation protocols, product temperature and other operating parameters had to be considered. After more than two years of trial and error, the solution proved to be a lip seal, coupled with a 316-stainless sleeve that fitted over the shaft and could be swapped out when grooving occurred.

While process changes occur infrequently, packaging is another matter. Just Born intends to adopt the Just Right front-of-pack nutritional labeling program, beginning with per-serving calorie information on Mike and Ike packages later this year. The firm's landfill-free status may be trumpeted on products at a later date.

Changes in package type are more complicated, but candy makers intent on the premium market are adopting high-end looks such as the folding box wrapper for individual pieces of chocolate. Sapal SA, a Écublens, Switzerland-based division of Bosch Packaging Technology Co., recently introduced the Starpac600 HL, a chocolate wrapping machine that can hermetically seal individual pieces with a die-fold appearance using oriented polypropylene, extending shelf life and reducing the cost of packets that use aluminum foil.

According to Matthew Carey, senior sales manager, there are machines with higher throughput rates than the Starpac's 600 pieces per minute, but they can produce only one wrap style. Throughput takes a back seat to flexibility when distinctive packaging is the goal, and the servo-driven Starpac is capable of multiple package types with its dual-star wheel folding sequence. "Changeover time is critical," he adds, and the machine uses a tool-less system.

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