Cup Filling and Sealing Machine Troubleshooting: Causes & Fixes

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Problems on this page:

Fill weight varying Lid seals leaking Cups not dropping or dropping double Lids missing or skewed Product dripping onto the flange Date code missing or unreadable Cups crushed in the carrier plates Cup or lid decontamination alarm Jams at the outfeed

Fill weight varying

Hits OEE: Quality

Symptoms: Cup weights drift and checkweigher rejects rise.

Product temperature or viscosity changing

Keep the product at the filling temperature set in the recipe.

Dosing piston seals worn

Replace the dosing seals on schedule.

Product tank level swinging

Keep the buffer tank level steady.

Air in the product

Check for air drawn in at pumps and joints.

Prevention: Fill weights charted per lane.

Lid seals leaking

Hits OEE: Quality

Symptoms: Cups leak when squeezed or in transport.

Seal temperature, time or pressure wrong

Check the sealing settings against the recipe for the lid material.

Product on the cup flange

Stop drips onto the flange at filling.

Sealing head worn or uneven

Check the sealing heads and their silicone.

Lid material changed

Check the lid lot against its specification.

Prevention: Seal integrity tested on cups from each lane.

Cups not dropping or dropping double

Hits OEE: Availability

Symptoms: The cup dispenser misses cups or drops two at once.

Cup stack nested too tightly

Check the cup stacking and the supplier specification.

Denester settings wrong for the cup

Set the denester for the cup type.

Vacuum cups worn

Replace the worn suction cups.

Static holding cups together

Check the ionisation where fitted.

Prevention: Cup dispensing checked at each changeover.

Lids missing or skewed

Hits OEE: Quality

Symptoms: Lids are missing, crooked or overhang the cup.

Lid magazine low or lids stuck together

Keep the magazine filled and fan the lids when loading.

Lid placement suction weak

Check the vacuum to the lid pickers.

Lid stations misaligned

Align the lid station with the cup carriers.

Lids curled

Store lids flat in the conditions the supplier gives.

Prevention: Lid placement checked by camera or visually each hour.

Product dripping onto the flange

Hits OEE: Quality

Symptoms: Product strings or drips land on the cup rim and spoil the seal.

Nozzle suck-back too low

Adjust the suck-back.

Nozzle valve worn

Replace the nozzle valve seal.

Product too warm and runny

Fill at the specified temperature.

Nozzle too high above the cup

Set the nozzle height.

Prevention: Nozzles checked during each clean.

Date code missing or unreadable

Hits OEE: Quality

Symptoms: Codes on lids or cups are missing, faint or smudged.

Coder ink or ribbon low

Check the coder supplies.

Print head dirty

Clean the head.

Coder timing wrong for the speed

Set the trigger timing.

Lid surface wet

Keep lids dry before coding.

Prevention: Codes checked at start-up and each lot change.

Cups crushed in the carrier plates

Hits OEE: Availability

Symptoms: Cups split or deform in the carrier plates and product spills.

Carrier plates for the wrong cup size

Fit the right plates for the cup.

Cup walls thinner than specified

Check the cup lot against its specification.

Plate pockets damaged

Replace damaged plates.

Lifting stations misaligned

Align the lifters.

Prevention: Carrier plates inspected at each clean.

Cup or lid decontamination alarm

Hits OEE: Quality

Symptoms: The machine alarms on the cup or lid decontamination step.

Lamp or dosing unit past its life

Replace lamps or service dosing units on schedule.

Sensor dirty or faulty

Clean and check the sensor.

Settings changed

Compare with the validated settings.

Supply of the decontaminating agent low

Check the supply.

Prevention: Decontamination checks recorded each production day.

Jams at the outfeed

Hits OEE: Availability

Symptoms: Cups pile up or fall at the outfeed.

Outfeed conveyor speed too low

Match the outfeed to the machine output.

Stacker or case packer downstream stopped

Check the downstream machine.

Guides worn

Replace worn guides.

Cups sticking due to product on the outside

Fix drips at filling.

Prevention: Outfeed jams recorded.

Guidance only. Always follow lockout/tagout and your site's safe-work procedures, and verify against OEM manuals before acting.

Related equipment guides: filling machine · tray sealer · inkjet coder · checkweigher · case packer

Stop the same fault coming back

Recurring cup filling and sealing machine stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: it tracks OEE and downtime live from PLCs, IoT sensors or AI cameras; where cameras are fitted, the video of a stop sits next to its machine data so the cause can be reviewed; and a technician opens the work order from the stop in the same system. Data is hosted in the AWS EU region, and Fabrico and the company behind it hold ISO/IEC 27001, ISO/IEC 20000-1 and ISO 9001.

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Methods that cut recurring stops: the six big losses · root cause analysis · preventive vs predictive maintenance · TPM · SMED & changeover