The operation of the biscuit stacking machine must follow standardized procedures.

The biscuit layering machine is a key piece of equipment in biscuit production, primarily used to increase the layered texture of biscuits and enhance their crispness. It is suitable for the production of biscuits requiring a multi-layered texture, such as soda crackers and puff pastry biscuits.
Its working principle involves pressing the dough into sheets using rollers, and then repeatedly folding and pressing the dough sheets using a reciprocating mechanism or swing arm to form a multi-layered structure. Some models are also equipped with a sprinkling device to sprinkle shortening or dry powder between the dough layers during the layering process, further enriching the texture and flavor of the biscuits. Layering machines can be divided into two types based on the arrangement of the rollers: vertical and horizontal. Vertical layering machines achieve higher surface quality of the dough sheets through vertical rolling, which is beneficial for biscuit layering and fermentation; horizontal layering machines achieve more consistent force distribution in both longitudinal and transverse directions through dough sheet redirection, and some models use a single set of rolling mechanisms to simplify the structure and avoid speed synchronization problems.
The operation of the biscuit layering machine must follow standardized procedures to ensure layering accuracy, production efficiency, and equipment safety. The specific steps can be divided into six stages: pre-startup preparation, parameter setting, trial production and debugging, normal operation, shutdown, and cleaning and maintenance, as detailed below:
I. Pre-startup Preparation
Equipment Inspection
Mechanical components: Check that the conveyor belt, rollers, layering mechanism (such as flip plates, guide plates), cutting device, etc., are securely installed and free from looseness, jamming, or wear (for example, the roller surface should be smooth and free of dents to prevent dough sheet damage).
Electrical system: Confirm that the power connection is normal, and that safety devices such as the emergency stop button, protective barriers, and warning lights are in good working order.  Ensure that the touchscreen and control system display clearly and without errors after power-on.
Material preparation: Ensure that the biscuit dough sheets (or blanks) to be layered are of uniform thickness and have neat edges, and are placed on the feeding table (avoid stacking too thickly to prevent conveyor jamming); if the equipment has a sprinkling function (such as sprinkling sugar or sesame seeds), prepare the materials in advance and check that the sprinkling device is unobstructed. Hygiene and Cleaning
Wipe down the surfaces of the equipment that come into contact with food (conveyor belts, rollers, stacking troughs, etc.) with food-grade cleaning agents and rinse thoroughly with clean water to avoid residual impurities contaminating the product.
Inspect the bottom and surrounding areas of the equipment, cleaning up debris and oil stains to ensure a clean operating environment.
II. Parameter Settings (via touchscreen or control panel)
Basic Parameter Settings
Number of stacking layers: Set according to product requirements (e.g., 4 layers, 6 layers, 8 layers, etc.), ensuring it matches the maximum stacking capacity of the equipment (avoiding operation beyond the range).
Conveyor speed: Adjust according to the hardness and thickness of the dough sheet, ensuring synchronous conveying in the front and rear sections (too fast may cause stretching and deformation of the dough sheet, too slow may cause accumulation).
Cutting parameters (if integrated cutting function): Set the cutting length and interval to ensure consistent size of each biscuit blank for precise stacking.
Auxiliary Function Settings
Sprinkling amount (if applicable): Control the uniformity of sprinkling by adjusting the rotation speed of the sprinkling roller or the valve opening (e.g., for sugar sprinkling, it should cover more than 2/3 of the dough sheet surface, avoiding local accumulation).
Alignment deviation correction: If there is left-right offset during stacking, the position of the guide plate can be fine-tuned via the touchscreen (generally within a range of ±5mm).
III. Trial Production and Debugging
No-load Trial Run
Start the equipment and let the conveying system and stacking mechanism run without load for 1-2 minutes. Observe whether all components are running smoothly and whether there are any abnormal noises or jamming (if the rollers rotate unevenly, the bearings need to be checked).
Test the emergency stop function: Press the emergency stop button and confirm that the equipment stops immediately. Check if the parameters return to normal after restarting. Material Feeding and Debugging
Feed a small amount of biscuit dough and observe whether the feeding is smooth and whether the dough is flat after passing through the rollers (if wrinkles appear, adjust the roller pressure or conveying speed).
Check the stacking effect: whether the first and second layers are aligned, and whether the edge deviation is within the allowable range (usually ≤2mm); whether there is tilting or detachment after multi-layer stacking (this can be solved by adjusting the force of the push plate of the stacking mechanism).
If there is a cutting function, check whether the cut blanks are complete and the cuts are neat.  Adjust the blade spacing or speed promptly if there are defective products.
IV. Normal Operation
Continuous Feeding
Maintain a continuous and even supply of biscuit dough on the feeding table, avoiding interruptions or sudden large accumulations (a dedicated person can be assigned to replenish the material to ensure that the material is always in the center of the conveyor belt).
Real-time Monitoring
Check the stacking quality every 10-15 minutes: whether the number of layers meets the setting, and whether there are any abnormalities in the alignment of each layer and the integrity of the biscuits (if a layer is found to be misaligned, immediately stop the machine and fine-tune the guiding device).
Observe the equipment operating status: whether the motor temperature is too high (≤60℃), whether the conveyor belt is running off-center, and whether the spreading device is blocked (if blocked, stop the machine and clean it to prevent material clumping).
Quality Sampling
Regularly sample the stacked biscuit blanks, measure the consistency of thickness and weight, record the data, and compare it with the process standards. If the deviation exceeds the limit, adjust the parameters promptly (for example, if the thickness is too thick, the roller pressure can be increased appropriately).
V. Shutdown Operation
Normal Shutdown
After all the remaining material in the equipment has been conveyed (to avoid spoilage of residual material in the equipment), press the "Stop" button. After all mechanisms have completely stopped, turn off the power. If you need to change the product type, you must first empty all materials from the equipment, then reset the parameters and perform debugging.
Emergency Shutdown
In case of emergencies such as material jamming, abnormal equipment noise, or electrical leakage, immediately press the emergency stop button, disconnect the main power supply, and then troubleshoot the problem (in case of material jamming, manually clear the material; do not reach into the moving parts while the equipment is running).
VI. Cleaning and Maintenance After Shutdown
Thorough Cleaning
Disassemble removable parts (such as the material hopper and cutting blades), and rinse off residual materials with hot water; wipe the conveyor belt and roller surfaces with a soft cloth to prevent oil stains or sugar residue from hardening and becoming difficult to clean.
Clean the gaps inside the equipment (such as the connections of the stacking mechanism) to prevent debris accumulation and bacterial growth.
Daily Maintenance
Check the tension of the conveyor belt and adjust it promptly if it is loose; apply food-grade lubricating oil to the roller bearings, the rotating shafts of the stacking mechanism, and other parts (1-2 times a week, adjust according to the operating frequency).
Record the equipment operating time, fault conditions, and adjustment parameters to create an operation log for future maintenance reference.