The evolution of the mogul (starch molding machine) from the 1950s to today is a story of engineering precision and speed optimization. The starch-molding technique itself is older, but the modern mogul dates to 1952, when NID founder Hans Arthur Faerber introduced automated tray handling and deposition. Those mid-century machines were still mechanically driven: a tray-handling mechanism carried starch-filled trays under a depositor whose piston pumps filled the impressions stamped in the starch. Output was low, measured in hundreds of pounds per hour, and starch handling stayed labor-intensive, with manual leveling and drying between runs.
The first major innovation was automatic starch conditioning: dryers and coolers that returned starch to the mogul continuously rather than in batches, which cut downtime and made the starch fully reusable. Servo-driven depositors later replaced mechanical cams and linkages, and programmable logic controllers let operators set fill volumes, nozzle timing, and starch bed density from a screen. Today’s high-speed moguls run at 35 to 40 trays per minute, and the largest current models are rated up to about 4,500 kilograms (roughly 10,000 pounds) of product per hour.
Features Added for Higher Speeds
Depositor Advancements
- Servo-driven pistons: Replace mechanical cam-and-linkage drives for faster, more consistent fill cycles.
- Multi-nozzle pump bars: Full-tray depositors fill every impression in one stroke, with two-stroke and multi-pump layouts for layered or two-color products.
- Quick-change tooling: Allows switching between product shapes without extensive downtime.
Starch Handling Enhancements
- Automated starch conditioning: Sensors monitor moisture and temperature, adjusting drying cycles in real time.
- High-speed tray conveyors: Belt and chain systems move trays in sync with the depositor at up to 40 trays per minute.
- Starch recovery systems: Dust collectors and screw conveyors capture starch for reuse, minimizing loss at high throughput.
Control Systems
- PLC and HMI interfaces: Provide real-time monitoring of deposition weight, speed, and alignment.
- Automated alignment sensors: Confirm each tray is positioned correctly under the depositor before the fill cycle.
What Was Sacrificed?
The push for speed did not come without trade-offs:
- Changeover flexibility: The fastest machines favor long runs of a single product. Lines that switch shapes and formulas often run at 32 to 36 trays per minute instead of the 40-tray ceiling, because each changeover means re-timing the depositor and swapping molds and pump bars.
- Starch conditioning: A slow machine tolerates starch that is a few points off on moisture. At 40 trays per minute, starch must be dried to a tight moisture band and cooled before reuse, or pieces stick and impressions collapse. That conditioning requires dedicated dryers and cooling capacity.
- Operator skill requirement: While automation reduces labor, it also requires trained technicians to program, maintain, and troubleshoot servo and control systems. The art of hand-tweaking the mogul has been replaced by software, which is less forgiving of process variations.
Starch Dust and Explosion Risk
Enclosed starch handling arrived for safety reasons as much as for speed. Cornstarch dust is combustible. A cloud of it in the air can ignite. Open tray handling and manual starch transfer kept fine powder suspended in the air, and workers who breathed it developed respiratory problems. Closing the starch circuit and moving it by screw conveyor cut the amount of combustible dust in the air, which reduced both the explosion risk and worker exposure. Modern moguls recover starch through sealed conveyors and dust collectors rather than open buckets. The same enclosure that enables continuous starch reuse also made the plant safer.
Since the 1950s, the mogul has exchanged manual control for automated precision. Output and consistency improved, and manufacturers now balance changeover flexibility, starch conditioning, and higher upfront capital against what a fast line produces.