Serpentine conveyor-based dough proofing system and method for continuous baking processes
View Patent ↗A compact serpentine conveyor-based dough proofing system and method for continuous baking processes is disclosed. The system comprises a vertically stacked array of alternating-direction conveyors that guide dough in a serpentine path, enabling extended proofing travel within a compact linear footprint. The dough enters at the top conveyor and sequentially drops through a series of conveyors below, each reversing direction to maximize space efficiency. The system includes an enclosed housing with zoned environmental control, providing warmer, humid conditions at upper levels and cooler, drier conditions at lower levels, optimizing fermentation and dough surface properties. The method allows for continuous dough proofing with precise control over time, temperature, and humidity, accommodating various dough forms such as extruded, braided, or cut strips. The optional features include post-proofing stiffening via refrigeration and pre- or post-proofing caustic treatment. The present invention improves throughput, energy efficiency, and product quality in continuous baking lines.
1 . A serpentine dough proofer system comprising:
a. a stack of at least three conveyors arranged in vertically spaced, alternating-direction layers, each lower conveyor receiving dough from a drop zone at an end of an upper conveyor and conveying in a horizontal direction opposite the upper conveyor;
b. an enclosed housing surrounding the stack and partitioned into at least four vertically distinct environmental control zones;
c, for each zone, a steam injector, an air mover, and both a temperature sensor and a humidity sensor positioned to sense conditions within that zone;
d. a controller operatively coupled to the conveyors and to the steam injectors and air movers of the zones and programmed to maintain a monotonic set-point gradient in which two or more upper zones are controlled to higher temperature and higher humidity than two or more lower zones during proofing, while advancing the dough along the alternating conveyors in a continuous serpentine path, the controller being configured to control conveyor speed and environmental conditions based on a desired proofing profile, and
e. a caustic bath unit positioned upstream of a refrigeration section, the refrigeration section being downstream of the enclosed housing and configured for cooling or stiffening the dough prior to baking or slicing.
2 . The system of claim 1 , wherein the plurality of zones comprises at least four vertically distinct zones, each independently controllable.
3 . The system of claim 1 , further comprising includes a dough input system configured to deliver a continuous dough stream or discrete dough portions onto the topmost conveyor.
4 . The system of claim 1 , further comprising includes a plurality of drop zones disposed between adjacent conveyors to allow the dough to descend sequentially from one conveyor to the next in a serpentine path.
5 . The system of claim 1 , wherein the plurality of conveyors comprises at least ten conveyors, each having a length of 40 feet, thereby enabling a total proofing path of 400 feet within a linear footprint of about 10 feet.
6 . The system of claim 1 , wherein each environmental control zone includes a respective one of the steam injectors, one of the air movers, one of the temperature sensors, and one of the humidity sensors, such that the environmental control zones collectively create a thermal and humidity gradient from the topmost conveyor to the bottommost conveyor.
7 . The system of claim 1 , wherein the topmost conveyors are configured to operate in a warmer and more humid environment than the bottommost conveyors, to promote initial fermentation and surface conditioning of the dough.
8 . The system of claim 1 , wherein the controller is a programmable logic controller (PLC) configured to adjust conveyor speeds and environmental parameters in real-time based on dough type or product recipe.
9 . The system of claim 1 , wherein each conveyor is made of food-grade material and is removably mounted to facilitate cleaning and maintenance.
10 . The system of claim 4 , wherein the drop zones include angled chutes or curved guides to minimize mechanical stress on the dough during vertical transfer between conveyors.
11 . The system of claim 1 , wherein the dough remains a continuous ribbon throughout proofing.
12 . A method for proofing dough in a continuous baking process using a compact serpentine conveyor system, the method comprising the steps of:
a. delivering a continuous ribbon of dough to a top conveyor of a vertically stacked, alternating-direction conveyor system;
b. advancing the dough along a serpentine path by sequentially dropping between adjacent conveyors;
c. enclosing the conveyors within plural an enclosed housing partitioned into at least four vertically distinct environmental control zones and sensing temperature and humidity in each zone; and
d. controlling steam injection and airflow per zone with a controller to maintain a monotonic gradient with higher temperature and humidity in two or more upper zones than in two or more lower zones while the dough traverses the serpentine path, the controller being operatively connected to the conveyors and the environmental control zones and configured to control conveyor speed and environmental conditions based on a desired proofing profile; and
e. subjecting the dough to a caustic bath upstream of a refrigeration section and then cooling or stiffening the dough in the refrigeration section located downstream of the enclosed housing prior to baking or slicing.
13 . The method of claim 12 , wherein the proofing environment is controlled using steam injection and humidity modulation to maintain zoned environmental conditions across the vertical stack.
14 . The method of claim 12 , further comprising cutting the continuous ribbon of dough into discrete portions after proofing in the serpentine conveyor system and proofing the discrete portions in a second proofing system located downstream of the serpentine conveyor system.
15 . The method of claim 12 , wherein the dough remains a continuous ribbon throughout proofing.
16 . The system of claim 1 , further comprising a second proofing system located downstream of the serpentine dough proofer system and configured to receive dough portions cut from the continuous ribbon after proofing in the serpentine dough proofer system.
17 . The method of claim 1 , wherein advancing the dough along the serpentine path comprises moving the dough through at least about 400 feet of travel within a linear footprint of not more than about 10 feet measured in a primary conveying direction.
18 . The system of claim 1 , wherein each of the conveyors includes a perforated or mesh belt configured to permit vertical flow of steam and conditioned air between the environmental control zones.
19 . The system of claim 1 , further comprising a self-aligning belt mechanism configured to maintain alignment between the stacked conveyors and reduce belt mis-tracking during operation.