Foam, splashing, unstable fill weights, and leaking lids can reduce product quality and slow down production. A properly adjusted Yogurt Filling and Sealing Machine helps control these problems by coordinating yogurt temperature, pump speed, filling height, nozzle movement, and sealing pressure. Yijianuo provides yogurt filling and sealing solutions for manufacturers that need cleaner filling, higher accuracy, and more reliable packaging.
Before changing machine settings, determine whether the problem comes from the yogurt, the filling system, the container, or the sealing process. Most users want a practical diagnosis because changing several parameters at once makes the cause difficult to find.
Identify the Main Cause of Yogurt Foaming and Splashing
Yogurt can hold air after mixing, fermentation, pumping, or transfer from the storage tank. Air expands during filling and creates foam at the container surface.
- Take a sample directly from the production tank.
- Take a second sample from the filling nozzle.
- Compare the amount of foam in both samples.
- If the sample from the nozzle contains more foam, inspect the pump, pipe joints, valves, and suction line for air entry.
- If both samples contain similar foam, improve product deaeration, mixing, and transfer conditions before adjusting the filling machine.
Check whether the yogurt contains too much trapped air
A high-speed jet, a narrow nozzle, or a nozzle positioned too far above the cup can cause the yogurt to hit the container surface and splash.
- Stop the machine after a safe shutdown.
- Check whether the nozzle is centered over the container.
- Measure the distance between the nozzle tip and the yogurt surface.
- Look for bent nozzles, damaged tips, product buildup, or uneven nozzle heights.
- Restart the machine at low speed and observe the filling stream.
Inspect the filling stream and nozzle position
Lightweight cups may move during filling, while narrow openings can increase splashing. A lid may also fail to seal if foam or yogurt remains on the rim.
- Confirm that the cup diameter matches the machine tooling.
- Check that the cup is stable during indexing and filling.
- Inspect the cup rim for deformation or contamination.
- Confirm that the lid material is compatible with the cup material.
- Check whether the lid is stored flat and protected from dust and moisture.
Check whether the cup and lid are suitable for the process
Correct troubleshooting requires more than changing the filling speed. Prepare the following tools so operators can measure the process and record the effect of every adjustment.
Prepare the Required Tools and Equipment
- Calibrated digital scale for checking net weight.
- Food-grade thermometer for measuring yogurt temperature.
- Stopwatch for checking filling and indexing time.
- Ruler or feeler gauge for checking nozzle height.
- Clean transparent cups for observing the filling stream.
- Clean inspection tray for checking splashing and leakage.
- Magnifying glass for inspecting cup rims, sealing film, and seal edges.
- Record sheet or digital production log for comparing settings.
Required measurement tools
- Food-grade cleaning solution approved for the product line.
- Sanitary brushes for nozzles, valves, and product pipes.
- Lint-free wipes.
- Spare seals and gaskets.
- Spare filling nozzle tips.
- Personal protective equipment required by the plant.
Required cleaning and maintenance tools
- Disconnect the machine from production and follow the lockout procedure when required.
- Clean all product-contact parts.
- Check that no yogurt residue is blocking the nozzle or valve.
- Inspect all hose connections for loose clamps or damaged seals.
- Confirm that the product tank has enough yogurt to keep the pump inlet covered.
- Check that the cup feeder, filling station, lid feeder, and sealing station are correctly aligned.
- Return all adjustable parts to the documented standard setting before starting the test.
Prepare the machine before adjustment
Product condition has a direct effect on filling quality. Yogurt that is too warm may become too fluid and splash easily. Yogurt that is too cold may become too thick, causing slow filling, stringing, and unstable weight.
Control Yogurt Temperature, Viscosity, and Air Content
- Measure the yogurt temperature in the storage tank.
- Measure the temperature again near the filling nozzle.
- Compare the two readings to identify temperature changes in the transfer line.
- Use the approved process temperature for the specific yogurt recipe.
- Allow the product and equipment to reach a stable condition before collecting test data.
- Record the temperature together with filling speed and product weight.
The correct temperature depends on the yogurt formulation, culture, solids content, and packaging requirements. Do not copy a temperature setting from another product without confirming product quality and food safety requirements.
Set a consistent yogurt temperature
- Keep the pump inlet fully covered with yogurt.
- Remove unnecessary bends and high points in the suction line.
- Tighten sanitary clamps and inspect gaskets for air leakage.
- Confirm that the pump is not running faster than the supply from the tank.
- Use a smooth, continuous product flow instead of frequent pump starts and stops.
- Check whether the agitator is creating a vortex that draws air into the yogurt.
- Reduce excessive agitation after fermentation if the recipe permits it.
Reduce air entry during product transfer
If the yogurt is transferred into the tank with visible foam, allow the product to rest for the approved time before filling. Avoid filling directly after a high-shear mixing or transfer operation unless the process has been validated for that condition.
- Keep the tank covered during the settling period.
- Use a low-shear agitator setting when continuous mixing is required.
- Do not scrape large air pockets into the pump inlet.
- Do not add unvalidated antifoam agents to food products.
Allow foam to settle before filling
The most effective machine adjustments are gradual. Change one setting at a time, run a short test, and measure the results before making another change.
Adjust the Filling Nozzle and Yogurt Filling and Sealing Machine
- Place an empty cup under the filling nozzle.
- Align the nozzle with the center of the cup.
- Lower the nozzle as close as practical to the filling surface without touching the yogurt or cup.
- If the machine supports bottom-up filling, set the nozzle for controlled movement during filling.
- Check that every nozzle has the same height and center position.
- Run several cups at low speed and inspect the surface for splashing.
A nozzle that is too high allows the yogurt stream to fall and impact the product surface. A nozzle that is too low may touch the product, cause contamination, or interfere with the cup. The correct position should provide a short, stable flow path without contact.
Set the correct nozzle height
- Record the current filling speed and fill weight.
- Reduce the pump speed or filling flow rate by a small increment.
- Run at least 10 test cups.
- Check foam height, splashing, fill weight, and cycle time.
- If the result improves, repeat one small adjustment.
- Stop adjusting when the product surface is stable and the required output is maintained.
Very high speed is a common cause of splashing, but excessively low speed can create stringing and production losses. The target is a steady stream rather than the lowest possible speed.
Reduce filling speed gradually
A sudden opening of the filling valve can create a pressure surge. A sudden closing action can create dripping, tailing, or product splashing.
- Set a short, low-flow opening stage at the beginning of filling.
- Use the normal filling flow after the product stream becomes stable.
- Reduce flow slightly before the target volume is reached if the control system supports it.
- Close the valve cleanly without excessive pressure.
- Adjust the anti-drip function so that the nozzle does not retain a hanging drop.
Use a controlled start and stop profile
- Use a pump suitable for the yogurt viscosity and required accuracy.
- Avoid excessive pressure that turns the product into a high-speed jet.
- Check whether pulsation from the pump is visible in the filling stream.
- Inspect the pump inlet for restrictions that may cause cavitation or air intake.
- Confirm that the product pipe diameter is suitable for the required flow rate.
- Use a buffer or pressure control system if the process requires a more stable supply.
Check pump selection and pressure stability
Even a correctly adjusted nozzle can splash if the container moves, tilts, or arrives late at the filling station.
Prevent Splashing by Controlling Cup Movement and Filling Sequence
- Check that the cup is fully seated in the mold or holder.
- Inspect the indexing mechanism for excessive movement.
- Adjust the guide rails so the cup remains centered without being crushed.
- Confirm that the cup holder is clean and free of product residue.
- Run the machine at low speed and observe the cup during the complete index cycle.
- Tighten or replace worn guide parts if the cup moves during filling.
Align the cup before filling
- Do not begin filling before the cup has stopped completely.
- Set sufficient dwell time for the filling valve to open and close smoothly.
- Ensure that the nozzle has reached its intended position before product flow begins.
- Prevent the nozzle from rising too quickly at the end of filling.
- Synchronize the cup feeder with the filling cycle to prevent partial or off-center fills.
Coordinate indexing, filling, and nozzle movement
For thick yogurt, fruit yogurt, or products that foam easily, bottom-up filling can reduce the distance that the product falls. The nozzle starts near the bottom of the cup and rises as the cup fills.
- Confirm that the cup and nozzle design support bottom-up filling.
- Set the starting nozzle position above the cup bottom without touching it.
- Begin with a low flow rate.
- Raise the nozzle at a speed that keeps the nozzle tip below the yogurt surface when possible.
- Test the final nozzle withdrawal movement to prevent a sudden surface disturbance.
- Inspect the filled cup for foam, tailing, and product on the rim.
Use bottom-up filling for difficult products
Foam near the cup rim is a major cause of weak seals, leakage, contamination, and rejected products. Filling control must therefore be coordinated with lid placement and heat sealing.
Prevent Foam from Causing Poor Sealing
- Inspect the rim immediately after filling.
- Reduce the fill height if yogurt regularly reaches the sealing area.
- Adjust the nozzle position so the product does not strike the side wall and climb onto the rim.
- Check the anti-drip setting after every fill cycle.
- Clean product residue from guides and transfer components.
- Reject cups with contaminated or deformed rims before sealing.
Keep the cup rim clean and dry
- Use the approved sealing temperature for the film and cup material.
- Set enough sealing time to create a complete bond without damaging the packaging.
- Apply uniform sealing pressure across the entire rim.
- Confirm that the sealing mold is centered over the cup.
- Keep the sealing surface clean and free of yogurt residue.
- Check that the film is flat and correctly positioned before sealing.
Set the sealing process correctly
- Collect sealed cups from the first stable production run.
- Inspect the seal visually for wrinkles, gaps, burn marks, and product contamination.
- Perform an approved peel, leak, or pressure test.
- Check the seal around the entire circumference rather than only one point.
- Record the sealing temperature, time, pressure, product temperature, and fill weight.
- Repeat the test after the machine reaches normal operating temperature.
Inspect seal quality after adjustment
A documented adjustment sequence helps operators solve foaming and splashing without creating new problems in weight accuracy or sealing quality.
Follow a Step-by-Step Adjustment Procedure
- Measure yogurt temperature at the tank and nozzle.
- Check the product for visible foam and air pockets.
- Confirm that the recipe, viscosity, and solids content are within specification.
- Allow excessive foam to settle if the validated process permits it.
First step: Confirm the product condition
- Stop the machine safely.
- Clean the tank outlet, pump inlet, product pipe, valve, and nozzle.
- Check all gaskets, clamps, and hose connections.
- Replace damaged or hardened seals.
Second step: Inspect and clean the product path
- Place an empty cup in the filling position.
- Center the nozzle over the cup.
- Set the nozzle height close to the product surface without contact.
- Confirm that the cup does not move during the filling cycle.
Third step: Set the cup and nozzle alignment
- Set the machine to a low or trial speed.
- Fill 10 cups.
- Inspect the yogurt surface and cup rim.
- Measure each cup to calculate average weight and weight variation.
Fourth step: Start with a low filling speed
- Adjust filling speed first.
- Test the nozzle height next.
- Adjust valve opening and closing timing.
- Adjust pump pressure or flow control if required.
- Change sealing settings only after the filling surface is stable.
Fifth step: Adjust one parameter at a time
- Run the machine at the intended production speed.
- Collect samples at the beginning, middle, and end of the run.
- Check fill weight, foam level, rim cleanliness, seal quality, and leakage.
- Record the final settings in the operating instruction.
- Train operators to return to the approved settings after cleaning or product changeover.
Sixth step: Validate the complete production cycle
Many filling problems are caused by incorrect adjustments rather than equipment failure. Avoid the following practices when operating a Yogurt Filling and Sealing Machine.
Avoid Common Yogurt Filling Mistakes
High speed may improve output temporarily, but it can also increase pressure, turbulence, foam, and splash. Establish a stable product flow first, then increase speed in small steps.
Do not increase speed before stabilizing the product
If operators change pump speed, nozzle height, temperature, and sealing pressure simultaneously, they cannot identify which adjustment solved the problem. Change one variable, run a controlled test, and record the result.
Do not change several settings at once
A nearly empty tank, a blocked inlet, or a leaking suction connection can cause air to enter the product stream. Maintain a consistent product level and inspect the supply line before modifying the machine program.
Do not fill with an unstable product supply
Product buildup changes the shape of the filling stream and can cause dripping or uneven distribution. Clean the nozzle after the approved production cycle and replace worn parts when cleaning no longer restores a stable stream.
Do not use a dirty or damaged nozzle
A machine may appear to have a filling problem when the real cause is a deformed cup, unsuitable film, or contaminated rim. Test the complete package combination rather than evaluating the filler alone.
Do not ignore cup and film compatibility
Never solve foam problems by using unapproved chemicals, unsafe temperatures, or uncontrolled holding times. All product and cleaning changes must follow the plant's food safety system and validated process limits.
Do not sacrifice food safety for lower foam
Purchasing teams usually want more than a machine speed number. They need to know whether the equipment can handle the actual yogurt formula, cup format, hygiene requirements, and future production plans.
Use a Purchasing Checklist for a Reliable Yogurt Filling and Sealing Machine
- Yogurt type, viscosity, and solids content.
- Plain yogurt, fruit yogurt, stirred yogurt, or other formulations.
- Target filling volume and allowable weight variation.
- Cup material, cup diameter, cup height, and cup shape.
- Lid film material and sealing method.
- Required production capacity per hour.
- Required cleaning and changeover time.
Confirm product and package requirements
- Servo or pneumatic filling control.
- Adjustable pump speed and stable flow control.
- Anti-drip filling nozzles.
- Bottom-up filling capability.
- Automatic nozzle height adjustment.
- Recipe storage for different yogurt products.
- Fill weight monitoring and adjustment options.
Ask about filling control features
- Uniform sealing pressure.
- Adjustable sealing temperature and time.
- Film alignment control.
- Easy-to-clean product-contact parts.
- Sanitary stainless steel construction.
- Accessible valves, pumps, nozzles, and gaskets.
- Safety guards and emergency stop functions.
Ask about sealing and hygiene features
- Send the actual yogurt formula or a representative product to the equipment supplier.
- Provide the exact cup and lid materials that will be used in production.
- Run the machine at the required filling volume and target speed.
- Inspect foam, splashing, weight accuracy, rim cleanliness, and seal strength.
- Request a record of the final filling and sealing parameters.
- Confirm spare parts, operator training, installation support, and after-sales service.
Request a product trial before purchase
Foaming and splashing can return after cleaning, product changeover, or maintenance if the original settings are not documented. A simple control plan helps keep the filling process stable.
Maintain Stable Performance After Troubleshooting
- Product temperature range.
- Tank level range.
- Pump speed or filling flow rate.
- Filling valve opening and closing time.
- Nozzle height and bottom-up movement settings.
- Target filling weight and acceptable tolerance.
- Sealing temperature, pressure, and dwell time.
- Cleaning frequency and replacement schedule for seals and nozzles.
Record the approved operating parameters
- Inspect the first filled cup after startup.
- Check fill weight at defined intervals.
- Inspect the cup rim before sealing.
- Check sealed cups for leakage and incomplete bonding.
- Record any change in foam level or filling stream shape.
- Stop and investigate if the problem exceeds the approved limit.
Perform routine production checks
If foam remains after product deaeration, nozzle alignment, flow control, and sealing adjustments have been checked, the cause may involve pump sizing, valve design, pipe configuration, or a mismatch between the yogurt formula and the equipment. Yijianuo can help review the product, packaging, filling volume, and production speed to identify a suitable Yogurt Filling and Sealing Machine configuration.
With stable yogurt preparation, controlled filling speed, correct nozzle positioning, secure cup handling, and clean sealing surfaces, manufacturers can reduce foam, prevent splashing, improve fill accuracy, and protect package quality. Yijianuo supports these goals with practical Yogurt Filling and Sealing Machine solutions for consistent yogurt packaging.
Contact the equipment supplier when adjustments do not solve the problem
